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OpenStudy (anonymous):
Please help! :( I have the correct answer but I dont understand how to get it. The question is: Twelve volunteers was given an experimental drug for inducing sleep, and the time x in minutes until each person fell asleep accordingly. The results were mean=20.2 and s=5.32. Assuming that the population of times is normally distributed , a 90% confidence interval for the mean time until the person taking this drug falls asleep.
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OpenStudy (anonymous):
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