study the effect of alcohol on reaction time.  It is known that under regular circumstances the distribution of reaction times is normal with μ = 195.  A sample of 15 subjects is obtained.  Reaction time is measured for each individual after consumption of alcohol.  Their reaction times were: 210, 216, 211, 240, 217, 219, 221, 222, 222, 227, 228, 223, 230, 228, and 232. Use α = 0.05.

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