21. Teaching Methods A new method of teaching reading is being tested on third grade students....

21. Teaching Methods A new method of teaching reading is being tested
on third grade students. A group of third grade students is taught using
the new curriculum. A control group of third grade students is taught
using the old curriculum. The reading test scores for the two groups are
shown in the back-to-back stem-and-leaf plot.
Old Curriculum New Curriculum

9 3
9 9 4 3
9 8 8 4 3 3 2 1 5 2 4
7 6 4 2 2 1 0 0 6 0 1 1 4 7 7 7 7 7 8 9 9
7 0 1 1 2 3 3 4 9
8 2 4

Key: 9 0 4 0 3 = 49 for old curriculum and 43 for new curriculum
At a = 0.10, is there enough evidence to support the claim that the new
method of teaching reading produces higher reading test scores than the
old method does? Assume the population variances are equal.

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