What are the null and research hypotheses, both symbolically and in plain English?
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: Ho: ?Belinda’s sample = ?all zippers
Hr: ?Belinda’s sample ? ?all zippers
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