# Comparison Distribution for Sample Scores

Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, the Z score on the comparison distribution for the sample score, and your conclusion. Assume that all populations are normally distributed.

Study Population Sample Score p Tails of Test

u s

A 5 1 7 .051 (high predicted)

B 5 1 7 .052

C 5 1 7 .011 (high predicted)

D 5 1 7 .012

https://brainmass.com/statistics/hypothesis-testing/statistics-265762

#### Solution Preview

For Study A:

z -score = (7 - 5)/1 = 2

At .05 significance level, the z-score is +1.64

Z-score cut-off value = +1.64

Since 2 > 1.64 so reject Null hypothesis.

For Study ...

#### Solution Summary

The solution examines comparison distribution for sample scores. Z-score cutoffs are determined.