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A manufacturing process drills holes in sheet metal that are supposed to be .5000 cm in diameter. Before and after a new drill press is installed, the hole diameter is carefully measured (in cm) for 12 randomly chosen parts. At α = .05, do these independent random samples prove that the new process has smaller variance? Show the hypotheses, decision rule, and test statistic.
New drill: 0.5005 0.5010 0.5024 0.4988 0.49970.4995 0.4976 0.5042 0.5014 0.49950.4988 0.4992
Old drill: 0.5052 0.5053 0.4947 0.4907 0.50310.4923 0.5040 0.5035 0.5061 0.49560.5035 0.4962
At the end of each academic year, 13% of assistant professors become associate professors and 18% leave the department; 21% of associate professors become full professors, and 17% leave the department; and 9% of full professors leave the departmen..
What is the difference between a one-tail and a two-tail test? How do we identify each? What is meant by a p-value?
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A survey of 1,233 visitors to Mumbai last year revealed that 110 visited a small cafe during their visit. Laura claims that 10% of tourists will include a visit to a cafe.
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