A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 150" K on the sidewall of the tire. A random sample of n = 17 indicates a sample mean tread wear index of 143.7 and a sample standard deviation of 18.3. Complete parts (a) through (c). a. Assuming that the population of tread wear indexes is normally distributed, construct a 90% confidence interval estimate of the population mean tread wear index for tires produced by this manufacturer under this brand name. sHIS (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 O A. Yes, because a grade of 150 is not in the interval () R. No because a trade of 150) is in the intervalpoint(s) pe A consumer organization wants to estimate the actual tread wear index of a brand name of tires that claims "graded 150" K on the sidewall of the tire. A random sample of n = 17 indicates a sample mean tread wear index of 143.7 and a sample standard deviation of 18.3. Complete parts (a) through (c) A. Yes, because a grade of 150 is not in the interval O B. No, because a grade of 150 is in the interval C. Yes, because a grade of 150 is in the interval O D. No, because a grade of 150 is not in the interval c. Explain why an observed tread wear index of 152 for a particular fire is not unusual, even though it is outside the confidence interval developed in (a)