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eye gre 4ster Does eye grease work In one study 16 student subjects took a...

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eye gre 4ster Does eye grease work In one study 16 student subjects took a test of sensitivity to contrast after three hours fac ing into bright sun both with and without eye grease This is a matched pairs design If eye grease is effective subjects will be more sensitive to contrast when they use eye grease Here are the differences in sensitivity with eye grease minus without eye grease 2 EYEGRS 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 Kathy Willens AP Images W SUTO We want to know whether eye grease increases sensitiv ity on the average a What are the null and alternative hypotheses Say in words what mean u your hypotheses concern b Suppose that the subjects are an SRS of all young people with normal vision that contrast differences follow a Normal distribution in this population and that the standard deviation of differences is

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