Is a z test or a t test appropriate? Why?
Belinda Buttons of the Peerless Zipper Company is in charge of quality control for the production of their 12-inch zippers. Recently, she has become worried about a disturbing drop in the quality of the zippers produced by her division. The zippers should be normally distributed with ? = 12 and ? = .10. She randomly samples 100 zippers and finds their mean length to be 12.06 inches. Do Belinda's zippers differ significantly from the population of zippers?
Ans: A z test because we know the population standard deviation
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