Homework 8.1 question. 7 (F)

Suppose the lengths of the pregnancies of a certain animal are approximately normally distributed with mean u = 158 days and standard deviation o = 9 days. Complete Courses parts (a) through (f) below. urse Home . . . mework The probability that the mean of a random sample of 64 pregnancies is less than 155 days is approximately 0.0038 . (Round to four decimal places as needed.) lizzes & Tests Interpret this probability. Select the correct choice below and fill in the answer box within your choice. udent Activity (Round to the nearest integer as needed.) orkbook O A. If 100 independent random samples of size n = 64 pregnancies were obtained from this population, we would expect sample(s) to have a sample mean of exactly 155 days. cudy Plan O B. If 100 independent random samples of size n = 64 pregnancies were obtained from this population, we would expect sample(s) to have a sample mean of radebook 155 days or more. C. If 100 independent random samples of size n = 64 pregnancies were obtained from this population, we would expect 0 sample(s) to have a sample mean of StatCrunch 155 days or less. Chapter Conten (e) What might you conclude if a random sample of 64 pregnancies resulted in a mean gestation period of 155 days or less? Incor This result would be unusual, so the sample likely came from a population whose mean gestation period is less than 158 days. eText (f) What is the probability a random sample of size 15 will have a mean gestation period within 9 days of the mean? Tools for Succes The probability that a random sample of size 15 will have a mean gestation period within 9 days of the mean is (Round to four decimal places as needed.) Multimedia Lib Purchase Option