An advertising agency would like to make an advertisement for a fast food restaurant claiming that the average waiting time from ordering to receiving your order at the restaurant is less than 5 minutes. The agency measured the time from ordering to delivery of order for 25 customers and found that the average time was 4.7 minutes with a standard deviation of 0.6 minutes.

1. State the null and alternative hypotheses.

2. Calculate the value of the test statistic

3. determine the critical value of the rejection region

4. what is your conclusion?