The lifespan of xenon metal halide arc-discharge bulbs for aircraft landing lights is normally distributed with a mean of 3,000 hours and a standard deviation of 500 hours. If a new bal- last system shows a mean life of 3,515 hours in a test on a sample of 10 prototype new bulbs, would you conclude that the new lamp's mean life exceeds the current mean life at 5 .01? What is the p-value?
Answer to relevant QuestionsDiscuss the issues of statistical significance and practical importance in each scenario. a. A process for producing I-beams of oriented strand board used as main support beams in new houses has a mean breaking strength of ...Find the critical value of Student's t for each hypothesis test. a. Two-tailed test, n = 18, α = .05 b. Right-tailed test, n = 15, α = .10 c. Left-tailed test, n = 31, α = .01 The manufacturer of Glo-More at white interior latex paint claims one-coat coverage of 400 square feet per gallon on interior walls. A painter keeps careful track of 6 gallons and finds coverage (in square feet) of 360, 410, ...9.44 Interpret each p-value in your own words: a. p-value = .387, H0 : π ≥ .20, H1: π < .20, α = .10 b. p-value = .043, H0 : π ≥ .90, H1: π < .90, α = .05 c. p-value = .0012, H0 : π ≥ .50, H1: π < .50, α = .01 The recent default rate on all student loans is 5.2 percent. In a recent random sample of 300 loans at private universities, there were 9 defaults. (a) Does this sample show sufficient evidence that the private university ...
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