Question

10. (12 pts) Your competitor widget maker took a random sample of 8 widgets and measured x. He got the values listed below. He is new in the business and has little knowledge of the value of population standard deviation of x. All he is going by are the 8 values he got below and an assumption that the xis distributed normally in the population: x 16.4 16.9 17.1 17.2 16.8 17.1 16.8 16.9 Compute the 95% confidence interval for the population mean of the competitor's dimension x.

Answer 1

classmate Date n-I

Thus we find that the population mean :

μ e(16.6904. 17.1096)

NOTE : the shaded region corresponds to the confidence interval.