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Of all of the individuals who develop a certain rash, suppose the mean recovery time is 30 days. The company chooses a random sample of

Of all of the individuals who develop a certain rash, suppose the mean recovery time is 30 days. The company chooses a random sample of 100 individuals who have used the cream, and determines that the mean recovery time for these individuals was 28.5 days. Given a standard deviation of 8, determine the highest significance level that would you accept that the recovery time is less than 30 days.

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