A survey provided the estimate that the mean number of hours of television viewing per household is 7.25 hours per day. Assume that the survey involved 200 hoouseholds and that the sample standard deviation was 2.5 hours per day. Ten years ago the population mean number ofh hours of televisionn viewing per household was reported to be 6..70 hours. Use a= 0.01 to test the claim that the number of current hours has increased from 10 years ago.
a. Type of test: "one tail" or "two tail"
b. What is the critical value, Za?
c. What is the test statistic, Z?