The average U.S. daily internet use at home is 150 minutes (). A sample of 81 (n) homes in Philadelphia showed an average usage of 165 minutes (x) with a sample standard deviation of 54 minutes (s). We are interested in determining whether the average usage in Philadelphia city is significantly greater than the U.S. average.

1. State your null and alternative hypotheses:

2. What is the value of the test statistic? Please show all the relevant calculations.

3. What is the rejection criterion based on the critical value approach? Use = 0.05.

4. What is the Statistical decision (i.e., reject /or do not reject the null hypothesis)? Justify your answer.