Nancy Joon, Inc has 1,500 employees. A simple random sample of 81 ...

[APUS57]

Nancy Joon, Inc has 1,500 employees. A simple random sample of 81 employees was selected, and the individuals in the sample were asked how much they contribute (monthly) to their retirement accounts. Sample mean, = 150, standard deviation, s = 45
 a. Estimate the standard error of the mean.
  b. Develop an approximate 95 confidence interval for the population mean.

Question 2

The smaller the spread of scores around the mean:
 a. the smaller the variance of the data set.
  b. the smaller the standard deviation of the data set.
  c. the smaller the coefficient of variation of the data set.
  d. All of these choices are true.

[debra928]

Answer to Question 1

a. 4.86 (rounded)
b. 140.28 to 159.72

Answer to Question 2

D

[APUS57]

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[carojassy25]

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