Compute a P-value for the right-tail test in example 9.25 on p. 272 and state your con- clusion about a significant increase in the number of concurrent users.
Example 9.25 (Z-TEST ABOUT A POPULATION MEAN). The number of concurrent users for some internet service provicer has always averanged 5000 with a standart deviation of 800. After an equipment upgrade, the averange 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.