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
A 5 1 7 .051 (high predicted)
B 5 1 7 .052
C 5 1 7 .011 (high predicted)
D 5 1 7 .012
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 ...
The solution examines comparison distribution for sample scores. Z-score cutoffs are determined.