A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is
A)1.875
B)40
C)5
D)15

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The Answer of A simple random sample of 64 observations was taken from a large population. The sample mean and the standard deviation were determined to be 320 and 120 respectively. The standard error of the mean is
A)1.875
B)40
C)5
D)15

A Simple Random Sample of 64 Observations Was Taken from a Large