A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 200" on the sidewall of the tire. A random sample of n = 17 indicates a sample mean tread wear index of 189.8 and a sample standard deviation of 17.3. Complete parts (a) through (b). a. Assuming that the population of tread wear indexes is normally distributed, construct a 95% confidence interval estimate of the population mean tread wear index for tires produced by this manufacturer under this brand name. sus (Round to two decimal places as needed.) b. Do you think that the consumer organization should accuse the manufacturer of producing tires that do not meet the perfomance information on the sidewall of the tire? Explain. A. Yes, because a grade of 200 is in the interval. B. No, because a grade of 200 is in the interval. OC. No, becau se a grade of 200 is not in the interval. OD. Yes, because a grade of 200 is not in the interval.