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A sample of n = 4 scores has a variance of s 2 = 64. What is the estimated standard error for the sample mean?

A sample of n = 4 scores has a variance of s² = 64. What is the estimated standard error for the sample mean?

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Question

A sample of n = 4 scores has a variance of s 2 = 64. What is the estimated standard error for the sample mean?