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Paragraph or letterProblemSolutionInstitutionLast NameFirst Name
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Winter 2024
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1.2 after (l)bad page break in some versions
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PP 1.4Bbehavioral cue vs. communicative cueprobably switch to communicative cues (7 of 8); solutions show both for now. Also interchange order of questions a and b
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Discussion after m in 4.7Missing period after “transformed parameter”
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Inv 4.8 intromu_nusicmu_musicDesign vs. study design in 4.84.3(h) missing space
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Inv 4.10 R codemissing parenthesesto use "with" function
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Example 4.2same R output repeatsupdate 2nd R output to new df
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Ch. 4 summaryt-producest-procedures
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2/2/2024Inv. 1.4 Technology Detour (Minitab)Hypothesized proportion shown in screen shot of Minitab window doesn't match what is happening in the investigationChange to 0.15, to match the investigationCentral CollegeMarkMills
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p. 187 R/JMP versionextra blank lines at top of page
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Inv 3.7switches to 90% but still includes zeromight as well keep at 95%
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3/18/2024Inv. 3.7(d)Random variable X is not definedMaybe you can/should define X in (d), just for clarity to know how to determine n, M, and NCentral CollegeMarkMills
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Fall 2023
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Inv 3.6rExplain you reasoning
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Inv 3.9bad page breaks, (c) mis numberedmore space in j, (c) to (g)
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very end of discussion of 4.2 prob detourshould really be comparing the distribution of the standardized statistic to the t-distribuitonuse sampling distribution for t-statistic instead of difference in means
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12/20PP 2.5Cobserve meanobserved mean
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12/21example 3.2definition of Black householdsextra (
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ch 3 summary R commandsmissing )
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inv 2.7the10%needs space
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8/10Inv 1.4(m)May not have enough spaceCal Poly
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8/8Inv 1.6, paragraph before (g)We will consider pi_0 a plausible for piWe will consider pi_0 a plausible value for piCal PolyPalmer
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8/11Inv 1.10 summary boxz* in wald and adjusted wald formulasmore of a superscript
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8/14PP 1.16Cextra ([Hint
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inv 1.14 summary boxz* and extra )
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8/14Example 1.2 solution(e) approximate; (f) Weapproximation; we can enter
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9/26PP 1.9AThe problem needs to have a stem to introduce the situation before having students do part (a).Central CollegeMillsMark
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12/12/23Inv AStill two ppm uses (including in graph)Change to ppb
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12/13/23Inv 2.7Definition of systematic sample "takes selects"replace with "selects"
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12/15/23Example 2.1subjectssubject's
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new PP 2.5Ccan impact inv 2.6 (j) spacing
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case 1total sample size squished
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Example 3.1missing graph
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R version - Rel risk summary
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Winter 2023
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1/13Inv 1.3 (k)Not enough space for answer in JMP/R versionCal PolyChanceBeth
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1/24Inv 1.8 (k)subscriptions should not be plural?or do the subscripts
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1/27Inv 1.8Technology Detour One Proportion z-test R instructionsarguments for iscamonepropztest are observed, n, hypothesized, alternative, conf.level). See Summary box.
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PP 1.9AInterchanged questions a and b but then the context isn't introduced before a
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2/2Inv 1.17 (b)What symbols would you useThey are only asked about the percentage and don't want to encourage them to say phat = 25.4%
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2/2Inv 1.17 (g)With the updated data, the p-value is .03 so most don't like "very strong evidence"Ask instead about "strong evidence"?
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2/6Inv 2.1Awkward page break in JMP/R version (p. 124)
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2/8iscamaddnormstray value appeared in outputremoved the stray value, removed the grid, added options for adding x-label and/or title (myxlab and mytitle)
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2/9iscamdotplotcouldn't add a main titlenow can add a main title (mytitle)
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3/1Inv 4.2Probability explorationSpacing is awkward in several places
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3/9PP4.5Shouldn't have skipped (a). Make sure the question about how they can use summary statistics/context to recognize the skewed nature of the distributions.
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3/20Inv. 2.1I can't find anywhere in this investigation where it says that "birthweight" is in gramsMaybe add this as a parenthetical note in the first sentence of the second paragraph of the "Discussion" section?Central CollegeMillsMark
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Fall 2022
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9/13PP 1.3BIncorrect data for Yukon"6 of 8", not "7 of 8"Central CollegeMillsMark
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9/13PP 1.4BIncorrect data for Yukon"6 of 8", not "7 of 8"Central CollegeMillsMark
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9/13PP 1.4A (c)Typo - "null and appropriate""null and alternative"Central CollegeMillsMark
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10/5PP 1.9AIncorrect reference to PP 1.7BShould reference PP 1.8BCentral CollegeMillsMark
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10/5PP 1.9A(c)It would be nice if the problem specifically asked students to calculate the margin of error for a 99% CICentral CollegeMillsMark
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10/5PP 1.9A(a and b)The order of these questions seems wrong. I always teach that students check the validity conditions first and then calculate an interval or run a test after they know the z-procedures are valid. (I tell them they should "look before they leap".)Maybe just interchange (a) and (b)?Central CollegeMillsMark
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10/5Inv. 1.9(l)The instructions for this part just references "these intervals"It might be clearer to say "the intervals in (k)"Central CollegeMillsMark
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10/5PP 1.6(a)Students don't seem to understand that the "trial and error" method they're supposed to use is what they just did in Inv. 1.6Maybe add the parenthetical "(like you did in Investigation 1.6)" after "trial and error" in the instructionsCentral CollegeMillsMark
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10/23Inv. 2.1 between (b) and (c)Wrong number of rows305,536Central CollegeMillsMark
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10/23Inv. 2.1(f)2016 is cited instead of 2020Central CollegeMillsMark
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10/23Inv. 2.1(m)It might be good to specify that students use a histrogram of the birthweight data for overlaying the normal model.Central CollegeMillsMark
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10/23Inv. 2.1 (n)Wrong column in Calc > Calculator commandShould be C6, not C2Central CollegeMillsMark
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Winter 2022
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1/14Inv 1.7(j)mangermanagerCal PolySabbagAnelise
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1/17Inv 1.8 references phat but hasn't really been definedCan define phat here or in Inv 1.5Central CollegeMillsMark
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1/18Inv 1.8 after (s)paragraph references Investigation 1.2Should reference Investigation 1.3Cal PolySabbagAnelise
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1/31Inv 1.11 (e)References second pull-down menuShould be third pull-down menuCal PolySabbagAnelise
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2/11Inv 3.1 (s)missing period in questionAdd period after distributionCal PolySabbagAnelise
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2/15Inv 3.5 after lapplet instructions suggested selecting the Plot optionShould probably leave as the cards optionCal PolySabbagAnelise
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3/7PP 3.1BNo direction is given for Ha, reference is unclearReference PP 1.1B and consider specifying a direction (or allow either with justification)Central CollegeMillsMark
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3/18Inv. 2.1 (n)Typo in Minitab calculator expression.Second "std" should be "stdev"Central CollegeMillsMark
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3/18Inv. 2.1 (p)Incorrect Minitab directionsI think "Single" should now be "Simple" (at least in my cloud version of Minitab)Central CollegeMillsMark
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4/8Inv. 4.5 (d) and (h)SubscriptsMaybe use same subcripts (unrestricted, deprived) for x-bars and s as what is used in Inv. 4.4, since this is a place where the scenario from Inv. 4.4 is being used again.Central CollegeMillsMark
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4/8Inv. 4.5 (h)Lack of specificityIt seems like you should say the given interval is a 95% confidence interval for mu_unrestricted - mu_deprived, otherwise, it may not be clear what parameter is being estimated with the interval.Central CollegeMillsMark
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4/12Inv. 4.9 (Speed It Up)The graph of the differences has the differences taken in the reverse order from what is happening in the rest of the investigation (no music - music)Central CollegeMillsMark
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4/28Invs. 5.1, 5.1A, 5.2Validity conds. for chi-square test are inconsistentIn this Invs. 5.1 and 5.2, you say "80% of expected cell counts exceed 5", but in Inv. 5.1A you say "80% of expected cell counts at least 5".Central CollegeMillsMark
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Fall 2021
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9/28Prac Prob 1.4Asuggests testing that probability is below .10should test above .10? solutions should refer to above 15 ppbCal PolyChanceBeth
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10/3Prac Prob 1.12 BTalks about quantitative data (average) but the inv no longer looks at means, only proportionsReplace question?Central CollegeLintonTom
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10/5Inv 1.15 after (f)Key Result is missing the word "of"not 20 times the size of the sampleCentral CollegeLintonTom
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11/15Inv 3.2Alignment of text in diagrams is offCal PolyChanceBeth
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11/11Inv 4.2 key result box between j and kThe symbols (4 of them) for mu did not printInclude the symbols for muCentral CollegeLintonTom
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11/15NBA dataSampling from Two Populations applet assumes data is sorted by groupsdata is now in pull down menu but make sure nba data lists all eastern than all western conference players (also clarify if it's 2020/21 season or 2021/22 season)Cal PolyChanceBeth
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Winter 2021
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1/4/21Inv AStill several ppm usesChange to ppbCal PolyChanceBeth
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1/7/21Inv A Study conclusionsmean is much larger than the meanmean is much larger than the medianCentralGoodmanRussell
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4/7/21Chapter 2 exercisesapplets names are inconsistent One Variable vs. Sampling Finite populationCentralGoodmanRussell
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2/8/21Inv 3.1 after (l)(2928 + 177)(2928+1771)Cal PolyChanceBeth
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Also watch consistency of subscripts used
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3/3/21Inv 4.4 (w)2456is actually 2533 (exact p-value .00718)
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3/3/21Inv 4.5 (f)exact p-value for t-statistic 0.00733
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3/3/21Inv 4.6part (c) in JMP/R versionneeds more spacing for answer
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3/8/21Inv 4.10JMP/R version at least part (c) and (d)No space to write answer for (c)
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Fall 2020
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