Question: Question 18 An experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual income. The

Question 18 An experiment involves selecting a random sample of 256 middle managers for study. One item of interest is their annual income. The sample mean is computed to be $35,420, and the sample standard deviation is $2,050. What is the sample standard error of the mean? $128.13

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