# Z Test for Comparison of Population Mean

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.

https://brainmass.com/statistics/z-test/z-test-for-comparison-of-population-mean-329034

#### Solution Summary

The solution gives a step by step method for computing Z test statistic for comparing population mean.

$2.19