Test Hypotheses About a Population Mean with Unknown
-A Bank $2.2$

Test Hypotheses about a Population Mean with Unknown
-A bank claims that the mean waiting time in line is less than $2.2$ minutes. A random sample of 20 customers has a mean of 2 minutes with a standard deviation of $0.8$ minute. If $\alpha = 0.05$ , test the bank's claim using $\mathrm { P }$ -values.