A sample of grocery store receipts has a mean of 157 and a s

A sample of grocery store receipts has a mean of $157 and a standard error of the mean of $4.77. Your job is to decide whether or not the mean of sales at this grocery store is different from $150.

Calculate the test statistic (the z-score).

Solution

As

z = (X - u) / SE

Then

z = (157 - 150)/4.77

z = 1.467505241 [ANSWER]