Suppose that a company claims that its batteries last 250 hours on average. It took many large samples, and each time the mean number of hours was outside the 95% confidence interval. Based on this information alone, which of the following is probably not the mean number of hours that the company's batteries last?

A. 240

B. 245

C. 250

D. 235

Question

Mathematics

Guest

15 April, 16:22

Suppose that a company claims that its batteries last 250 hours on average. It took many large samples, and each time the mean number of hours was outside the 95% confidence interval. Based on this information alone, which of the following is probably not the mean number of hours that the company's batteries last?

A. 240

B. 245

C. 250

D. 235

+1

Answers (1)

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Deandre Wolf · Answer 1

The correct choice is C, the reason being the Confidence Interval would have been based on the expected population mean of 250 hours. The means of "many large samples" were all outside the 95% Confidence Interval which was based on the expected population mean of 250 hours.