In an experiment designed to measure the time necessary for an inspector's eyes to become used to the reduced amount of light necessary for penetrant inspection, the sample average time n = 9 inspectors was 6.32 s and the sample standard deviation was 1.65 s. It has previously been assumed that the average adaptation time was at least 7 s. Assuming adaptation time to be normally distributed, does the data contradict prior belief? Using a hypothesis test with a=0.1, • What would be the critical value? A. -2.262 B. -1.383 C. -1.397 D. -2.306 • What would be the test statistic and conclusion? A. -2.145; Reject Ho B. -2.145; Fail to reject Ho C. -1.236; Reject Ho D. -1.236: Fail to reject Ho

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