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1 | j | The date of the typo fix is reported, if it has already been completed. | ||||||||||
2 | Date added to this spreadsheet | Corrected in B&W Paperback? | Corrected in Full Color physical books? | Corrected in Free PDF? | Corrected in GitHub Source? | Page Number | Marker | Original Text | Revised Text | Severity Score | Explanation | Thank you |
3 | 2022-05-01 | 2022-05-01 | 2022-05-01 | NA | NA | Most | Page numbers were not being shown for the version date stamped with April 12th, 2022 on the copyright page. | If you were impacted by this, please reach out to us at "admin [at] openintro.org" and include a photo of the full first page of the Preface. | 10 | OpenIntro Staff | ||
4 | 2021-04-03 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 11 | Exercise 1.1(d) | "However this is not" | "However, this is not" | 1 | Grammatical | OpenIntro Staff |
5 | 2019-05-04 | NA | NA | 2019-05-04 | 2019-05-04 | 11 | Exercise 1.2(d) | What is one other possible explanation for the observed difference between the percentages of patients that are pain free 24 hours after receiving acupuncture in the two groups? | Your findings so far might suggest a real difference in effectiveness of antibiotic and placebo treatments for improving symptoms of sinusitis. However, this is not the only possible conclusion that can be drawn based on your findings so far. What is one other possible explanation for the observed difference between the percentages of patients in the antibiotic and placebo treatment groups that experience improvement in symptoms of sinusitis? | 4 | Clarification | Ivaliy Ivanov |
6 | 2021-08-02 | No | 2023-05-27 | No | 2022-10-21 | 12 | Figure 1.3 | The 4 sample cases shown. | The cases shown are a reordering of the loan50 data set, which causes downstream issues with numbers not matching up (e.g. in constructing the mean on page 43). The correct cases should be shown in Figure 1.3 (unless we later remember a reason why we thought showing those 4 particular cases was instructive, in which case calculations will be updated in other parts of the book). | 3 | Typo | Elizabeth Lifschitz |
7 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 12 | Figure 1.4, definition of "grade" | which takes a values | which takes values | 1 | Grammatical | Steven Malan |
8 | 2021-11-22 | No | No | No | No | 15 | End of Guided Practice 1.6 | Last sentence ends in a question mark. | It should end in a period. | 2 | Grammatical | Irvin |
9 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2020-06-24 | 15 | Footnote 7 | There group varaible | The group variable | 1 | Grammatical | Irvin, Patti |
10 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 16 | Second paragraph | Additionally, graphs can be used to visually exploring the data. | Additionally, graphs can be used to visually explore data. | 1 | Grammatical | David Grilli |
11 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 19 | Exercise 1.4 | randomnly | randomly | 1 | Grammatical | Gabriel Chan |
12 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 19 | Exercise 1.5 | Additional description is in part (c). | Moving this above part (a) into the main body of the exercise. | 8 | Clarification | David Grilli |
13 | 2019-07-11 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-07-11 | 21 | Exercise 1.12 | shows voting patterns the United States | shows voting patterns in the United States | 1 | Grammatical | Wendy Pond |
14 | 2022-09-20 | No | No | No | No | 21 | Exercise 1.12 figure | The vertical axis is labeled as "% Yes" but lists proportions. | The axis label should list percentages (0% to 100%). | 2 | Clarification | OpenIntro Staff |
15 | 2020-05-16 | No | No | No | No | 29-30 | Exercises 1.17 - 1.18 | The term "parameter" and "statistic" have been included but without clarification in the text. | We aren't making updates quite yet, because the question may still be interpretable with the in-exercise explanation, but a future update might be made and we wanted to list this as a high severity typo because it might mean some teachers would prefer to skip on these two exercises. | 8 | Typo | Andrew Bulawa |
16 | 2019-07-11 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-07-11 | 30 | Exercise 1.18 | "cat videos.Determine" (missing space) | "cat videos. Determine" (space added after period) | 1 | Grammatical | Wendy Pond |
17 | 2020-05-28 | No | No | No | No | 35 | Exercise 1.31(a) | Question and solution are mismatched. | Likely will adjust the question. Will update further here when the change is made. We are listing this as a high-severity typo because this exercise might confuse students. | 8 | Typo | Scott S |
18 | 2019-07-21 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 37 | Exercise 1.39(b) | 3 years later, however, only | 3 years later. However, only | 1 | Grammatical | OpenIntro Staff |
19 | 2019-06-29 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-06-29 | 41 | Second paragraph | see pages 1.3 and 1.5 | see Figures 1.3 and 1.5 | 3 | Typo | Bradley Lubich |
20 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 44 | Example 2.7 | A trial of 1000 adults is set up, | A trial of 1500 adults is set up, | 3 | Typo | Andrea Casagranda |
21 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 45 | Footnote 5 | Other ways to describe data that skewed to the right: | Other ways to describe data that are right skewed: | 1 | Grammatical | Gyorgy |
22 | 2021-08-02 | No | No | No | No | 49 | Section 2.1.1. title | Scatterplots for paired data | We may update the title in a future edition to remove "paired data" reference, since could be confusing with the discussion of paired data later. (Technically this is also paired data, but probably not the form we hope people will think of.) | 2 | Clarification | Elizabeth Lifschitz |
23 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 51 | Footnote 13 | The second and third lines of the footnote were pushed to the bottom of the next page. | Reformatted so the footnote stays entirely on this page. | 3 | Formatting | Gyorgy |
24 | 2021-04-03 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 60 | Exercise 2.19(b) | "below" | "above" | 2 | Typo | Vy Hong, Morgan Johnson |
25 | 2022-09-20 | No | No | No | No | 60 | Exercise 2.20, first figure | Horizontal axis label "Hispanic %" | Horizontal axis label "Percent Hispanic", with a similar update of using log_10(Proportion Hispanic) for the second histogram. Also add "%" on the numeric labels of the first plot. | 1 | Clarification | OpenIntro Staff |
26 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 62 | Second paragraph | or who own their home (85.1%) | or who own their home (86.5%) | 4 | Typo | Wendy Pond |
27 | 2021-04-25 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 65 | Example 2.27 solution, 2nd paragraph | in of the six different group | in the six different group | 1 | Grammatical | Jenna Montgomery |
28 | 2019-06-30 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-06-30 | 66 | First full paragraph, first sentence | In Figure 2.25, we chose to first split by homeowner status of the borrower. | In Figure 2.24, we chose to first split by homeowner status of the borrower. | 3 | Typo | Bradley Lubich |
29 | 2022-04-16 | No | 2023-05-27 | No | 2022-10-21 | 71 | Section 2.3.1 first paragraph | Malaria is referred to as a virus here, but it is in fact a parasite | Update "virus" to "parasite" | 3 | Typo | Seshu Rao |
30 | 2021-05-02 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 71 | Section 2.3.1 first paragraph | 14 patients received an experimental vaccine or 6 patients received a placebo vaccine | 14 patients received an experimental vaccine and 6 patients received a placebo vaccine | 2 | Grammatical | Steven Malan, Elijah Isilva |
31 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 72 | Last paragraph before Section 2.3.2 | and conclude there was discrimination. | and conclude the vaccine was effective. | 3 | Typo | Harry Zhu |
32 | 2021-04-03 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 75 | Exercise 2.25(d)(ii) | "part (b)" | "part (c)" | 5 | Typo | |
33 | 2022-09-22 | No | 2023-05-27 | No | 2022-10-21 | 78 | Exercise 2.34 | The units of the numbers are not ever provided. | The units are in hours. | 2 | Clarification | OpenIntro Staff |
34 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 95 | First paragraph of 3.2.1 | from photo sharing website. | from a photo sharing website. | 1 | Grammatical | OpenIntro Staff |
35 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 95 | First paragraph of 3.2.1 | and these 659 photos represent a test for their classifier. | and these 1822 photos represent a test for their classifier. | 3 | Typo | Calli Holaway |
36 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 95 | Figure 3.11 | Label "pred_not" should be "mach_learn" and "not" should be "pred_not" | 5 | Typo | Gyorgy | |
37 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 98 | Second line of the first equation | Demoninator says "# cases where truth is fashion" | It should say "# cases where mach_learn is pred_fashion" | 8 | Typo | Gyorgy |
38 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 98 | Guided Practice 3.29 solution | P(truth is not) = 0.1696 | P(truth is fashion) = 0.1696 | 6 | Typo | Calli Holaway |
39 | 2022-03-06 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 111 | Exercise 3.18 | For simplicity, we only include heterosexual relationships in this exercise. | This sentence is a microaggression and has been dropped. We may make further updates to this exercise in the future. | 5 | Clarification | Leanne Merrill |
40 | 2022-09-24 | No | No | No | No | 128 | Exercise 3.37 figure | Vertical axis tick marks are positioned at 5, 15, 25, and 35. | The graph would be easier to read with tick marks at 0, 10, 20, and 30. | 1 | Formatting | OpenIntro Staff |
41 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 136 | First paragraph and figure caption | For instance, how many people have an SAT score below Ann’s score of 1300? This is the same as Ann’s percentile, which is the fraction of cases that have lower scores than Ann. We can visualize such a tail area like the curve and shading shown in Figure 4.6. | For instance, what fraction of people have an SAT score below Ann's score of 1300? This is the same as the percentile Ann is at, which is the percentage of cases that have lower scores than Ann. We can visualize such a tail area like the curve and shading shown in Figure 4.6. | 6 | Typo | Earvin Balderama |
42 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 136 | Figure 4.6 caption | The area to the left of Z represents the percentile of the observation. | The area to the left of Z represents the fraction of people who scored lower than Ann. | 4 | Typo | Earvin Balderama |
43 | 2021-04-25 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 137 | Example 4.7 solution | we can area left | we can find the area left | 2 | Grammatical | Jenna Montgomery |
44 | 2020-05-16 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 139 | First paragraph | percentile (or upper tail) | percentile (lower tail) or the upper tail | 3 | Grammatical | Poompat Saengudomlert |
45 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 139 | Footnote 11 | 1.65 --> 1430 | 1.6449 --> 1429 | 2 | Typo | OpenIntro Staff |
46 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 143 | 4.7(b) | days with lowest average high temperature | days with lowest high temperature | 4 | Typo | Yasushi Yoshida |
47 | 2019-05-07 | 2019-05-15 | 2019-05-15 | 2019-05-07 | 2019-05-07 | 144 | 2nd paragraph of 4.2.1 | Because 80% of the individuals will not hit their deductible, | Because 70% of the individuals will not hit their deductible, | 4 | Typo | Jack Yang |
48 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 144 | 2nd paragraph of 4.2.1 | 0.3 in for the insurance example | 0.3 in the insurance example | 1 | Grammatical | Calli Holaway |
49 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 145 | Example 4.22 | P(second person is the first to hit deductible) = P(the first won't, the second will) | P(second person is the first to not hit deductible) = P(the first will, the second won't) | 4 | Typo | Budi Wibowo |
50 | 2021-04-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 149 | Guided Practice 4.29 question | Brittany is the only one exceed | Brittany is the only one to exceed | 1 | Grammatical | Jenna Montgomery |
51 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 151 | Example 4.30 | who does not exceed the deductible | who does not exceed the deductible) (add closing parenthesis) | 2 | Grammatical | Yasushi Yoshida |
52 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 151 | Example 4.30 | The "choose" part of the formula is written incorrectly at one part of the equation: 8! / (5! (5 - 3)!) | It should be: 8! / (5! (8 - 5)!) (the other parts of the calculations were done with the correct values) | 4 | Typo | Jakob Walter |
53 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 149 | Example 4.28 | What is the chance exactly one of them will exceed the deductible and the other four will not? | What is the chance exactly one of them will exceed the deductible and the other three will not? | 4 | Typo | Gyorgy |
54 | 2020-03-31 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 156 | Exercise 4.18 | Title: "Chicken pox, Part I." | Title: "Chickenpox, Part I." | 1 | Grammatical | Micheal Pepper, Dahmian Owen |
55 | 2020-03-02 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 156 | Exercise 4.18 | While the statistic is innocuous and accurate, the source referenced is an anti-vaxxer website. | Reference this hospital page. | 4 | Clarification | René F. Najera |
56 | 2019-07-21 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 165 | Exercise 4.31(a) | Which distribution we have studied | Which distribution have we studied that | 1 | Grammatical | OpenIntro Staff |
57 | 2019-07-21 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 165 | Exercise 4.31(d) | during this time of day? | during this time of day. | 1 | Grammatical | OpenIntro Staff |
58 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 166 | Exercise 4.40 | (The material covered in Section 3.2 would be useful for this question.) | (The material covered in Section 3.2 on conditional probability would be useful for this question.) | 2 | Clarification | Joseph Herning |
59 | 2021-06-01 | No | No | No | No | 170 | First paragraph of 5.1.1 | Suppose a poll suggested the US President’s approval rating is 45%. We would consider 45% to be a point estimate of the approval rating we might see if we collected responses from the entire population. | [This could be worded better. We'll revisit this when updating for the 5th Edition.] | 2 | Clarification | Jenna Montgomery |
60 | 2019-08-11 | 2019-08-13 | 2019-08-13 | 2019-08-12 | 2019-08-12 | 170 | First paragraph of 5.1.2 | actual support expanding solar energy to be 0.88. | actual support for expanding solar energy is 0.88. | 1 | Grammatical | OpenIntro Staff |
61 | 2022-10-30 | No | 2023-05-27 | No | 2022-10-30 | 171 | Figure 5.1 description | Link to openintro.org/stat/labs | Link is being updated to point to openintro.org/book/os (to align with a website overhaul that launched at the start of 2020). | 3 | Typo | `cookiemonster` user on openintro.org in the Forums |
62 | 2019-06-29 | 2019-07-13 | 2019-07-13 | 2019-06-29 | 2019-06-29 | 173 | Example 5.4 | References for \mu_{\hat{p}} = 0.887 as well as the figure reflecting this. | These should be updated to a center of 0.88. | 6 | Typo | Bradley Lubich |
63 | 2021-07-11 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 173 | Footnote 4 | multiple | multiply | 2 | Grammatical | Steve Balzer |
64 | 2022-11-12 | No | No | No | No | 174 | First paragraph of 5.1.4 | was based on a Pew Research conducted a poll of 1000 American adults | was based on a poll conducted by Pew Research of 1000 American adults | 1 | Grammatical | Parijat Choudhury |
65 | 2019-06-29 | 2019-07-13 | 2019-07-13 | 2019-06-29 | 2019-06-29 | 174 | Last sentence of first paragraph of Section 5.1.4 | We can the conditions from | We can check the conditions from | 2 | Grammatical | Bradley Lubich |
66 | 2021-07-11 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 178 | Last paragraph of 5.1.5 | will always be take discrete | will always take discrete | 1 | Grammatical | Steve Balzer |
67 | 2021-07-11 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 178 | Section 5.1.6 first paragraph | and use then compute | and then compute | 1 | Grammatical | Steve Balzer |
68 | 2021-07-11 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 178 | Section 5.1.6 second paragraph | emphases | emphasizes | 1 | Grammatical | Steve Balzer |
69 | 2020-03-21 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 179 | Exercise 5.3(d) | name of the statistic can we use to | name of the statistic we use to | 1 | Grammatical | OpenIntro Staff |
70 | 2019-08-12 | 2019-08-13 | 2019-08-13 | 2019-08-12 | 2019-08-12 | 181 | Section title | Confidence intervals for a sample proportion | Confidence intervals for a proportion | 7 | Typo | OpenIntro Staff |
71 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 184 | Example 5.10 | Uses z^\star of 1.65 | Using 1.6449 instead. The upper limit also changes to 90.3%. | 2 | Typo | OpenIntro Staff |
72 | 2021-08-29 | No | No | No | No | 186 | Guided Practice 5.15 | It is not explicit in this Guided Practice exercise that the surveyed people are from a simple random sample. | While the survey mentioned does indicate it is the same as an earlier survey (where it was noted to be a simple random sample), we might update this at some point to further clarify this consideration. | 2 | Clarification | Elizabeth Lifschitz |
73 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 187 | 5.10(a) | This question discusses hypothesis testing concepts, which aren't covered until the next section. | Adding a note: "This part uses concepts from Section 5.3 and will be corrected in a future edition." | 7 | Typo | Benjamin Cooper Boniece |
74 | 2019-11-12 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 188 | 5.11(f) | Context is for means, but we haven't discussed SE or ME for means. | Adding a note: "Hint: the margin of error for a mean scales in the same way with sample size as the margin of error for a proportion." | 7 | Typo | Andrew Bulawa |
75 | 2019-08-11 | 2019-08-13 | 2019-08-13 | 2019-08-12 | 2019-08-12 | 189 | First sentence of 5.3.1 | We’re interested in understanding whether people know much about | We’re interested in understanding how much people know about | 1 | Grammatical | OpenIntro Staff |
76 | 2019-06-30 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-06-30 | 191 | Second paragraph, last sentence | does the data provide strong evidence that the proportion of college-educated adults is different than 33.3%? | does the data provide strong evidence that the proportion of all college-educated adults who would answer this question correctly is different than 33.3%? | 4 | Typo | Bradley Lubich |
77 | 2020-05-16 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 196 | Example 5.31 solution, item 1 | we just happened to get observe something so extreme that | we just happened to observe something so extreme that it | 1 | Grammatical | Tascha Shahriari-Parsa |
78 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 197 | Example 5.33 | Z test statistic was calculated as 3.75 | Z test statistic should be 3.85, making the one-tail area about 0.0001, not 0.0002 (and then making the p-value about 0.0002) | 3 | Typo | Budi Wibowo |
79 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 203 | Exercise 5.21 | Does not mention this is a random sample. | Mention it is a random sample. | 3 | Clarification | Elizabeth Lifschitz |
80 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 205 | Exercise 5.37(b) | Does not mention this is a random sample. | Mention it is a random sample. | 3 | Clarification | Elizabeth Lifschitz |
81 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 210 | Guided Practice 6.5 | Is it reasonable to model p-hat = 0.51 for a hypothesis test here? | Is it reasonable to model p-hat using a normal distribution for a hypothesis test here? | 3 | Clarification | Bradley Lubich |
82 | 2019-07-06 | 2019-07-13 | 2019-07-13 | 2019-07-20 | 2019-07-11 | 213 | Guided Practice 6.10, last sentence | how big should our monthly sample be for a margin of error of 0.04 with 95% confidence? | how big should our monthly sample be for a margin of error of 0.05 with 95% confidence? | 4 | Typo | Jack Yang |
83 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 213 | Footnote 4 | Uses z^\star of 1.65 | Using z^\star of 1.6449, the value of n should be at least 452.2, so a sample size of 453 will be sufficient. Using 1.6449, the p = 0.062 and p = 0.013 scenarios have minimum sample sizes of 1574 and 348, respectively. | 3 | Typo | Elizabeth Lifschitz |
84 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 2019-05-15 | 217 | First paragraph | thesingle-proportion | the single-proportion | 1 | Grammatical | Jack Yang |
85 | 2021-08-29 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 218 | Example 6.12 | Uses z^\star of 1.65 | Use z^\star of 1.6449. Using 1.6449, the interval should be -2.6% to 28.6%. | 2 | Typo | OpenIntro Staff |
86 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 221 | First bullet near the bottom | We do not accept the null hypothesis | We do not reject the null hypothesis | 7 | Typo | Neely Atkinson, Naoto Kunitomo |
87 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 225 | Exercise 6.19 | determine if the following statements are true or false | determine if the following statements about undergraduate college students are true or false | 2 | Clarification | Budi Wibowo |
88 | 2020-05-16 | No | No | No | No | 238 | Guided Practice 6.35 and later | Throughout we use df = 6. However, it was pointed out that we are also estimating p from the data, so this isn't quite right. | DF is closer to (exactly equal to?) 5. That said, this is hitting a nuance that is tricky and can be ignored for the purposes of intro stat (rarely comes up). We may add a footnote in the future, or swap out the example in a future edition. | 6 | Statistical | Neely Atkinson |
89 | 2023-07-01 | No | No | No | No | 239 | Exercise 6.34(d) | The wording "over others" could seem like a hint at greater complexity in this exercise for a careful reader (e.g. might think "others" here corresponds to the "Other" category, which it does not). | No update for this edition, but we'll revisit wording in the 5th Edition to remove "others" from that sentence to avoid confusion. | 3 | Clarification | user10 |
90 | 2021-07-20 | No | No | No | No | 248 | 6.49(a) | The 38% is not truly a perfectly precise estimate, but it is treated as such in the exercise. | There isn't a fix here, just an FYI that it should be treated as fixed for this exercise. This will be revised in the next edition. | 5 | Statistical | Budi Wibowo |
91 | 2019-05-19 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-05-19 | 250 | First sentence | Chapters 5 | Chapter 5 | 1 | Grammatical | Jack Yang |
92 | 2021-03-24 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2021-04-29 | 252 | Example 7.1 solution | while there is a small gap in the histogram on the right | while there is a small gap in the left histogram between 5 and 6 | 3 | Clarification | Ali R Kaya |
93 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 255 | Example 7.6 | with all observations are within 2.5 standard deviations of the mean. | since all observations are within 2.5 standard deviations of the mean. | 1 | Grammatical | Bradley Lubich |
94 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 257 | Last paragraph | Then we finding | Then we find | 1 | Grammatical | Chi Hyun Lee |
95 | 2019-05-19 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-05-19 | 258 | Example 7.16 solution | null value (98.29) | null value (93.29) | 4 | Typo | Jack Yang |
96 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 2019-06-08 | 263 | Example 7.18 T formula | SE subscript x_diff should have a bar over the x | Add the bar! | 2 | Typo | Tom Jansen |
97 | 2021-07-20 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 2022-04-12 | 263 | Example 7.18 figure | 2.98 | 3.58 | 4 | Typo | Mitchum Bock |
98 | 2019-08-10 | 2019-08-11 | 2019-08-11 | 2019-08-10 | 2019-08-10 | 264 | Last part of calculation in footnote 10 | (0.326.84) | (0.32, 6.84) (add comma) | 3 | Typo | Sandy Morales |
99 | 2019-10-20 | 2019-11-13 | 2019-11-13 | 2019-11-12 | 2019-11-12 | 270 | Figure 7.14 | top ... bottom | left ... right | 2 | Typo | Bradley Lubich |
100 | 2020-10-27 | No | No | No | No | 278 | No correction, just a note | We use the normal distribution, not the t-distribution. In Example 7.33, we give a brief explanation, but it might be useful to give a bit more detail. In short, the t-distribution changes based on sample size, so using the t-distribution would be tedious. Additionally, the t-distribution is very nearly the same as the normal distribution when the df is ≥30, so the approximation is very good in this case. If the suggested sample size was relatively small (<30), it would be useful to recompute the estimate a second time using the t-distribution with the degrees of freedom based on the initial calculation. This might also be an interesting topic to cover in a longer, guided exercise rather than in the text. | 1 | Clarification | spelee77 | |