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Unformatted text preview: 8-3 Testing a Claim Abt. A Proportion 17. In a study of store checkout scanners, 1234 items were checked and 20 checked items were found to be overcharges, and 1214 checked iterms were not overcharves. Use a .05 significance level to test the claim that with scanners, 1% are overcharges. Based on these results, do scanners appear to help consumers avoid overcharges? 8-4 Testing a Claim abt a Mean: σknown13.Randomly selected statistics students participated in an experiement to test their aility to determine when 1 min(60s) has passed. Forty students yielded a sample mean of 58.3 sec. Assumin that σ=9.5 sec, use a .05 signifi. lvl to test the claim that the population mean equal 60s. based on the result, does there appear to be an overall perception of 1 min that is reasonably accurate? 8-5 Testing a claim abt a mean: σunknown 21. Patients with chronic fatigue syndrome were tested, then retested after being treated. A standard scale from –7 to +7 is used to measure fatigue before and after the treatment. The changed are summarized with: n=21, x(bar)=4, s=2.17. The changes were computed in a way that fatigue before and after the treatment....
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This note was uploaded on 06/05/2008 for the course STAT 311 taught by Professor Tamrecardoso during the Fall '08 term at University of Washington.
- Fall '08