(b) Eleven pieces of steel were taken from Company A and Company B. It was found that the average defects detected were 15 and 13 with standard deviation of 3 and 2 respectively. Assumes the two sets of data are independent random samples from normal populations with equal variances. (1) Construct 98% confidence interval for the mean defects detected from Company B. Construct a 95% confident interval for difference means of defects detected from Company A and Company B. TEST

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