Asked by King

In a random sample of 1,000 exams, the average score was 500 points with a standard deviation of 80 points. Find the interval about the sample mean such that the probability is 0.90 that the mean number lies within the interval.

Answers

Answered by PsyDAG
90% = mean ± 1.645 SEm

SEm = SD/√n

I'll let you do the calculations.
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