n experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual incomes. The sample mean is computed to be $35,420.00. If the population standard deviation is $2,200.00, what is the standard error of the mean?
rev: 12_23_2020_QC_CS-245219
$2,200.00
$137.50
$147.74
$8.59
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