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Unformatted text preview: e distribution of flexibility rating for middle-aged men is approximately symmetric,
centered around 5.5, whereas the distribution for young adult men is skewed to the left
(negatively skewed) centered around 6.5, higher than the middle aged men. There is
quite a bit of variability in both distributions. In general there were more young men with
flexibility ratings at the high end of the scale and fewer at the low end of the scale than
for middle aged men.
Note: A clear description of the relative concentration of the two distributions (e.g. more
flexibility ratings for young men at high values than middle aged men but more middle
aged men at lower flexibility ratings than young men) is considered equivalent to a
description of shape. Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved.
AP is a registered trademark of the College Entrance Examination Board. AP® Statistics 2000 ─ Scoring Guidelines
Part a is
Essentially correct if correct graph(s) are drawn, using the same scale so that
comparisons can be made easily. Either frequency or
relative frequency can be used. Missing labels and legends
can be recovered if the description in (b) is clear and
complete. Missing scaling cannot be recovered. Partially correct if there are errors in the construction of the graphs
or the graphs are drawn using very different scales or the
graphs are incomplete (but started correctly). Example: no
scaling on graph Incorrect if any graphical displays that treat the frequencies as
data are used (scatterplot, boxplots, dot plots or stem and
leaf displays of the frequencies). Part b is
Essentially correct if the graphical displays from part (a) are
interpreted in context, with comments on the differences
and similarities in at least two of center, shape and spread,
and the response shows good communication of ideas.
(Discussion needs to be clearly linked to graphs and
comparison between the two groups must be explicit.) Note: It is not essentially correct to say the distribution...
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