A grocery store claims that customers spend an average of 5 minutes waiting for service at the store's deli counter. A random sample of 40 customers was timed at the deli counter, and the average service time was found to be 5.6 minutes. Assume the standard deviation is 1.5 minutes per customer. Using alphaequals0.10, complete parts a and b below. a. Does this sample provide enough evidence to counter the claim made by the store's management? Determine the null and alternative hypotheses.