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An experiment involves selecting a random sample of 256

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An experiment involves selecting a random sample of 256 middle managers. 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?

$8.01

$138.36

$128.125

$2,050

Reference no: EM13639936

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