Mathematics, 13.07.2020 17:01 Ap621765
An engineer for an electric fencing company is interested in the mean length of wires being cut automatically by machine. The desired length of the wires is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. Suppose the engineer decided to estimate the mean length to within 0.025 with 99% confidence. What sample size would be needed?
Answers: 3
represent the population deviation
the margin of error desired
  (a)
 (b)
, replacing into formula (b) we got:
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