A. The confidence interval for a population mean is (7.31, 7.57). What are the sample mean and the margin of error? B. A random sample of 33 strawberry fields gave a mean yield of 39 bushels per acre. From previous studies, it has been determined that the population standard deviation is 5.4 bushels per acre. Based on this, construct a 90% confidence interval for the true population mean yield. Give your answers as decimals, rounded to two places.