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We randomly select 49 students and ask how many hours they study outside the class per week. It turns out that the average of these
We randomly select 49 students and ask how many hours they study outside the class per week. It turns out that the average of these study hours is 30 hours and their standard deviation is 10 hours. We want to construct a 90% confidence interval for the average number of hours that students study outside the class per week. What is the lower bound
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