Essay
A professional rock climber claims that he can climb a particular mountain within half an hour.From a random sample of 20 attempts,the rock climber averaged 33.3 minutes with a standard deviation of 3.9 minutes.Is there sufficient evidence to suggest that the climber's claim is incorrect at a significance level of 10 per cent?
Correct Answer:
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H0 : μ ≤ 30 against H1 : μ > 30
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