Question: A caliper is a device used to very precisely measure the size of an object. A construction worker uses a caliper to take 4 measurements

A caliper is a device used to very precisely measure the size of an object. A construction worker uses a caliper to take 4 measurements of the thickness of a pane of glass. The values are (2.21mm, 2.19mm, 2.16mm, 2.22mm). Note that x = 2.195 and s = 0.0265. a) Calculate and interpret a 95% confidence interval for the average thickness of this pane of glass. b) What assumptions are required for this confidence interval to be valid? 5

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