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An experiment involves selecting a random sample of 256 middle managers at random for study. one item of interest is their mean annual income. the sample mean is computed to be $35,420 and the sample standard deviation is $2,050. what is the standard error of the mean?

Answer :

The standard error of the mean is 128.125.

The formula for standard error is:

[tex]\sigma_M=\frac{\sigma}{\sqrt{N}}[/tex]

With our information, we have:

[tex]\sigma_M=\frac{2050}{\sqrt{256}}=128.125.[/tex]

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