Statics

In designing an experiment, a psychologist is willing to assume that the underlying distribution for the time to learn a list of words is approximately normal with a standard deviation of 40 seconds. He wants to be 95% sure that the maximum error of his estimate of the mean is at most 10 seconds. What sample size should he use?

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1. 95% = mean ± 1.96 SEm

SEm = SD/√n

10 ≥ 1.96 (40/√n)

Solve for n.

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posted by PsyDAG

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