The thicknesses of 16 glass sheets made using process A have a mean of 3.04mm and a standard deviation of 0.15mm. In add

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The Thicknesses Of 16 Glass Sheets Made Using Process A Have A Mean Of 3 04mm And A Standard Deviation Of 0 15mm In Add 1 (34.55 KiB) Viewed 13 times

The thicknesses of 16 glass sheets made using process A have a mean of 3.04mm and a standard deviation of 0.15mm. In addition, the thicknesses of 18 glass sheets made using process B are measured and the mean is 3.12mm and the standard deviation is 0.20mm. Assume the two distributions to be normally distributed with equal variance population. (a) Construct a 95% confidence interval for the difference in the average thicknesses of sheets produced by the two processes. (8 marks) (b) At the 1% significance level, test the hypothesis that the average thicknesses of sheets produced by the two processes are equal. (8 marks)