Additional Information and Full Hypothesis Test Examples · Try It 11
In a study of 390,000 moisturizer users, 138 of the subjects developed skin diseases. Test the claim that moisturizer users developed skin diseases at a greater rate than that for non-moisturizer users (the rate of skin diseases for non-moisturizer users is 0.041%). Since this is a critical issue, use a 0.005 significance level. Explain why the significance level should be so low in terms of a Type I error.
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OpenStax, Introductory Statistics 2e · §9.5 Additional Information and Full Hypothesis Test Examples · Try It 11
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