The average rainfall last year was at least 13.5 cm. An environmental group believes that the average rainfall has fallen. With a sample of 65 days, they found an average rainfall of 11.5 cm. The population standard deviation is known to be 5.5 cm. Test the hypothesis that the average rainfall has decreased at the 0.05 level of signicance. Is this a one or two tail hypothesis test? (Enter "1" or "2") 1 QUESTION 2 Refer to the data in question 1. Determine the critical value. QUESTION 3 Refer to the data in question 1. Calculate the test statistic. (round your answer to 2 decimal places) QUESTION 4 Refer to the data in question 1. What is your decision in regards to the Null hypothesis? Enter "1" for Reject Ho Enter "2" for Do not reject Ho Enter "3" for Accept Ho