Against All Odds 2: Stemplots Video Questions
https://www.learner.org/series/against-all-odds-inside-statistics/stemplots-2/ (11:49)

This is an individual assignment, so all short-answer/paragraph responses should be in your own words.  Copying text of others will be checked for and punished accordingly.

After the assignment due date, these will be graded and scores/answers/feedback released.  You can then review your responses(as needed) and ideal answers to better learn the content.

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Period? *
Why was it important to have a database about soldiers? *
1 point
List two variables that were taken on soldiers for the sizing data bank. *
1 point
“When you see a set of unorganized numbers, it’s hard to tell if they have any rhyme or reason.”  First you should __________________ then use them to build a graph. *
1 point
In the stem and leaf plot made (around 6:30 in the film), the stem is _________________________ and the leaves are the _________________________. *
1 point
Stems are listed in order.  “Always include __________ possible stems… even those that don’t have leaves to go with them.” *
1 point
The final step in building a stemplot is to organize the leaves _____________________________. *
1 point
It should be noted that there needs to be EQUAL SPACING for each leaf, so that the graph can easily be used like a histogram.  In other words, care must be taken that 3 leaves don’t take up more horizontal space than 4, else area principle would be violated.

Also notice that a space separates each leaf.  Commas or decimals ARE NOT used.

All stem and leaf plots should also come with a key that gives a unit and shows how the data would be read.  Recall that the leaves follow a decimal point.  With this known, complete the legend for this plot, which uses a value seen in the plot.   Key: 24 | 6 = ___________ cm *
1 point
The next minutes of discussion for this plot present SHAPE, CENTER, SPREAD, and UNUSUAL FEATURES (CUSS) which is a required way of describing distributions.

The distribution is described as having a single peak (we call this UNIMODAL).  This is otherwise referred to as a MODE at the __________ cm range.  Note that because the mode includes a range of values, so we should specify it.  When we use numbers to specify, this makes our writing more PRECISE. *
1 point
Another rough center is identified at 26.8.  What term is used for this? (starts with an m) *
1 point
The maximum - minimum is called the r __________ and can be used to describe SPREAD. (This term is not used in the video, but can be found on page 75 of your textbook if you don’t already know it.) *
1 point
The host poorly uses language: “pretty symmetric.”  

This is better: (A)The distribution is skewed toward 32 cm, with 6 bins to the higher values compared to the mode at 26 cm, and only 2 bins to the lower values compared to the mode.

And after that…
(B) The value 32.8 appears to be an usual point, as there is a 2-bin gap with no values between 29.1 and 32.7 cm.  If I ignore this value and the single value at 29.0, there is a symmetric distribution centered at the mode of 26 m with two bins on either side of that mode.

Key: 32 | 8 = 32.8 cm
Can you tell why “pretty symmetric” is language to avoid?  In other words, why do you think it’s not OK to skip (A) and just use (B) to describe the graph? *
1 point
Pardis calls 32.8 an o________________.  In our class, you should only use this term when you can defend its use with a computation.  Bonus question: Do you know what that computation is?  Use 1.5 _________. *
1 point
The video producers cleverly show you with these two examples (foot size and fuel economy) that when building a stem plot (circle one) *
1 point
For the mpg data, the stem is expanded.  In this case, that means breaking the stem into two.  Remember all stems need to have an equal number of POSSIBLE outcomes, so you are not biasing your graph.  Consider a graph that is split like below.  

3 |
3 |
2 |
2 |
1 |

For the graph begun immediately above, type in the possible leaves for the two twenties stems, to prove to yourself that there are equal possible outcomes.  You'll want to type both stems and leaves in your answer.  Use the data values 29, 28, 27, 26, 25, 24, 23, 22, 21, 20. *
2 points
Why is it NOT OK to split a stem into three, but it would be OK to split a stem into 5? *
1 point
The shared stemplot is useful for comparing two sets of similar data.  Why are the titles needed here (you didn’t see titles on graphs before). *
1 point
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