A sporting goods store believes the average age of its customers is 36 or less. A random sample of 44 customers was surveyed, and the average customer age was found to be 38.9 years. Assume the standard deviation for customer age is 9.0 years. Using a = 0.05, complete parts a and b below. a. Does the sample provide enough evidence to refute the age claim made by the sporting goods store? Determine the null and alternative hypotheses. Ho : H H 1 : H VO The z-test statistic is. (Round to two decimal places as needed.) The critical z-score(s) is(are)]. (Round to two decimal places as needed. Use a comma to separate answers as needed.) Because the test statistic the null hypothesis b. Determine the p-value for this test. The p-value is. (Round to three decimal places as needed.)