See attached file.
Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give
(a) the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected,
(b) the Z score on the comparison distribution for the sample score, and
(c) your conclusion. Assume that all populations are normally distributed.
The solution gives a step by step method for computing Z test statistic for comparing population mean.