Test Hypotheses About a Population Mean with Unknown
-A Local $6.5$

Short Answer

Test Hypotheses about a Population Mean with Unknown
-A local retailer claims that the mean waiting time is less than 8 minutes. A random sample of 20 waiting times has a mean of $6.5$ minutes with a standard deviation of $2.1$ minutes. At $\alpha = 0.01$ , test the retailer's claim. Assume the distribution is normally distributed.