Which of the following is NOT an acceptable method of estimating the population standard deviation?
a. Perform a pilot study.
b. Divide the estimated range of variation by 2.
c. Use an estimate based on past studies of the same phenomenon.
d. Divide the estimated range of variation by 6.
e. Use an estimate based on the method used to measure the important variables.
Question 2
Toppen Olaf Olson, plant manager at the Ridgway Tanning Factory, was interested in the average number of hides currently sold each day at the plant. The daily variance of hides sold at the plant last year was 132 . Olaf would like to be 90 percent confident (z = 1.645) in his results and be within a daily range of +/ 5 hides. Olaf needs a sample of what size to achieve his desired level of precision and confidence?
a. 15
b. 22
c. 472
d. 1,886
e. 2,788
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