The cashier of a fast-food restaurant claims that the average amount spent by customers for dinner is Php XXXXXXXXXXA sample of 50 customers over a month was randomly selected, and it was found out...

The cashier of a fast-food restaurant claims that the average amount spent by customers for dinner is Php120.00. A sample of 50 customers over a month was randomly selected, and it was found out that the average amount spent for dinner was Php122.50. Construct the critical regions using a 0.05 level of significance to conclude that the average amount spent by customers is more than Php120.00. Assume that the population standard deviation is Php6.50.

(a) state the null and the alternative hypothesis
(b) compute the test statistic

(c) determine the critical value and sketch the
rejection region and the non-rejection region using the normal curve.