Suppose that drinking two standard (alcoholic) drinks increases reaction time by μ = 2 seconds with a = 3 seconds. If we want to carry out a one-sided significance test with a = 0.05 and 3 = 0.20 (so power is 80% ) what sample size is needed to detect this increase? Give your answer rounded to the nearest integer. The necessary sample size is n = 15. The necessary sample size is n = 18. The necessary sample size is n = 20.

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