The manager of a frozen yogurt store claims that a medium-size serving contains an average of more than 4 ounces of yogurt. From a random sample of 14 servings, she obtains a mean of 4.31 ounces and a standard deviation of .52 ounce. Test, with a=.05, the manager's claim. Find the p-value for the test. Assume that the distribution of weight per serving is normal