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Math 227(questions well answered)graded A+
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Math 227(questions well answered)graded A+
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Math 227(questions wellanswered)graded A+
Below is a list of a few of the variables in Fingers and descriptions of how they were coded. Which of
these variables might be associated with thumb length? (Check all that apply.)
Sex 1=female, 2=male, 3=prefer not to answer
RaceEthnic 1=White, 2=African-American, 3=Asian, 4=Latino, 5=Other
Year 1=First, 2=Second, 3=Third, 4=Fourth, 5=Other
MathAnxious Agreement with the statement, "In general, I tend to feel very anxious about
mathematics." 2=strongly agree, 1=agree, 0=neither agree not disagree, -1=disagree, -2=strongly
disagree
GradePredict 4.0=A, 3.7=A-, 3.3=B+, 3.0=B, 2.7=B-, 2.3=C+, 2.0=C, 1.7=C-, 1.3=Below C-
Ring Length in mm from tip of ring finger to the crease between the ring finger and palm
Height Height in inches
Weight Weight in pounds - correct answer ✔✔1. Sex
2. Race and ethnic
3. Height
4. Weight
F. Ring
, thumb lengths of students - correct answer ✔✔
Try to compare the two distributions above. Do thumb lengths vary by sex? - correct answer ✔✔Yes
Take a look at the density histograms you made. Do thumb lengths vary by sex? In what way? Is there
still variation in thumb length among people of the same sex? - correct answer ✔✔
Where should you look in the histogram to notice within-group variation? - correct answer ✔✔The
spread of the distribution.
You have learned to make some pretty fancy histograms now. Let's take a moment to reflect. What kind
of variables should go in gf_facet_grid()? - correct answer ✔✔Categorical
What kind of variables should go in gf_histogram()? - correct answer ✔✔Quantitative
What kind of variables should go in tally()? - correct answer ✔✔Categorical
Which of the following variables do you think would be worse than Sex at explaining variation in Thumb
length? (Check all that apply.) - correct answer ✔✔1. Job
2. Year
3. Race Ethnic
Of the two variables used to create the faceted histograms above (year in college and race/ethnicity),
which does a better job predicting thumb length? - correct answer ✔✔Neither seems like a good
Predictor.
We now have a sense of what it means to explain variation in one variable by variation in another. In the
previous section, for example, we saw that variation in thumb length could be explained, in part, by
variation in sex. In this section we want to begin developing a language for describing the variables that
play different roles in these relationships—relationships in which one variable explains variation in
another.
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