Confidence interval for sat scores
A college wants to know the lower limit of a two-sided 95% confidence interval for SAT scores on the Math section (range equals 200 to 800). They sampled 400 students and found that the sample mean was 550 and the sample standard deviation was 80.
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Mall security estimates that the average daily per-store theft is exactly $200, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds that =$180 and s = $40.
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The sample mean was calculated as = 5,064 hours. If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significant level that the claim is true?
Before each of his chemotherapy sessions, Allen is given a bowl of ice cream. The chemotherapy makes Allen nauseated. Now just seeing the bowl of ice cream makes him feel queasy. The chemotherapy is:
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