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A sample of n = 25 scores has a mean of M = 40 and a standard deviation of s = 10. What is the

A sample of n = 25 scores has a mean of M = 40 and a standard deviation of s = 10. What is the estimated standard error for the sample mean?

a. sM= 4

b. sM = 2

c. sM = 2.5

d. sM = 1

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