Question

Use the standard normal distribution or the t-distribution to construct a 95% confidence interval for the population mean. Justify your decision. If neither distribution can In a recent season, the population standard deviation of the yards per carry for all running backs was 1.21. The yards per carry of 25 randomly selected running backs 2.8 be used, explain why. Interpret the results are shown below. Assume the yards per carry are normally distributed 2.7 3.7 4.7 7.1 3.7 5.9 2.5 6.4 4.6 3.4 3.3 2.8 2.8 3.1 1.7 7.4 2.4 5.7 4.7 4.9 5.5 7.1 C. Use a t-distribution because n < 30 and ơ is known D. Use a normal distribution because ơ is known and the data are normally distributed 0 E. Cannot use the standard normal distribution or the t-distribution because σ is unknown, n 30, and the data are not normally distributed Select the correct choice below and, if necessary, fill in any answer boxes to complete your choice A. The 95% confidence interval is ( (Round to two decimal places as needed.) O B. Neither distribution can be used to construct the confidence interval

Answer 1