You wish to test the following claim (Ha) at a significance level of -0.005. For

Question

You wish to test the following claim (Ha) at a significance level of -0.005. For the context of this problem, d PostTest-PreTest whe the first data set represents a pre-test and the second data set represents a post-test. (Each row represents the pre and post test scores for an individual. Be careful when you enter your data and specify what your 1 and 2 are so that the differences are computed correctly.) You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain the following sample of data: pre-test post-test 13.2 45.3 52.5 9.8 40.4 19.2 37 34.4 4 38.4 36.2 39.8 50.9 32 41.1 49.1 34.2

Explanation / Answer

using Minitab:

Paired T-Test and CI: pre, post

Paired T for pre - post

N Mean StDev SE Mean
pre 19 40.16 11.14 2.56
post 19 29.35 22.23 5.10
Difference 19 10.82 20.50 4.70

95% CI for mean difference: (0.93, 20.70)
T-Test of mean difference = 0 (vs 0): T-Value = 2.30 P-Value = 0.034

hope this will be helpful Thanks and God Bless yu :-)

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