Question: A psychologist has to develop a new test of spatial perception, and she wants to estimate the mean score achieved by male pilots. How many

A psychologist has to develop a new test of spatial perception, and she wants to estimate the mean score achieved by male pilots. How many people must she test if she wants the sample mean to be in error by no more than 2.0 points, with 95% confidence? An earlier study suggests that σ = 21.2.

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