Use the standard normal distribution or the t-distribution to construct a 99% confidence interval for the population mean. Justify your decision. If neither distribution can be used, explain why. Interpret the results. In a random sample of 47 people, the mean body mass index (BMI) was 26.8 and the standard deviation was 6.11. - - - - - Which distribution should be used to construct the confidence interval? Choose the correct answer below. O A. Use a normal distribution because the sample is random, n 2 30, and o is known. O B. Use a t-distribution because the sample is random, the population is normal, and o is unknown. O C. Use a t-distribution because the sample is random, n 2 30, and o is unknown. O D. Use a normal distribution because the sample is random, the population is normal, and o is known. O E. Neither a normal distribution nor a t-distribution can be used because either the sample is not random, or n