Eye black Athletes performing in bright sunlight often

Chapter , Problem R9.2

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Eye black Athletes performing in bright sunlight often smear black grease under their eyes to reduce glare. Does eye black work? In one experiment, 16 randomly selected student subjects took a test of sensitivity to contrast after 3 hours facing into bright sun, both with and without Chapter Review Exercises Chapter Review Exercises 595 eye black. Here are the differences in sensitivity, with eye black minus without eye black:34 0.07 0.64 0.12 0.05 0.18 0.14 0.16 0.03 0.05 0.02 0.43 0.24 0.11 0.28 0.05 0.29 We want to know whether eye black increases sensitivity on the average. (a) State hypotheses. Be sure to define the parameter. (b) Check conditions for carrying out a significance test. (c) The P-value of the test is 0.047. Interpret this value in context. s Interpret a Type I error and a Type II error in context, and give the consequences of each. s Understand the relationship between the significance level of a test, P(Type II error), and power.

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