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Confidence interval for the true mean length of time

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Reference no: EM131921998

A random sample of 13 students were asked how long it took them on certain exam. The mean length of time was 109.3 minutes with a standard deviation of 77.6 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam.

Reference no: EM131921998

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