Compute a P-value for the right-tail test in Example 9.25 on p. 272 and state your conclusion about a significant increase in the number of concurrent users. Example 9.25 (Z-test about a population...

Example 9.25

(Z-test about a population mean). The number of concurrent users for some internet service provider has always averaged 5000 with a standard deviation of 800. After an equipment upgrade, the average number of users at 100 randomly selected moments of time is 5200. Does it indicate, at a 5% level of significance, that the mean number of concurrent users has increased? Assume that the standard deviation of the number of concurrent users has not changed.