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Author Question: An engineer for an electric fencing company is interested in the mean length of wires being cut ... (Read 43 times)

tuffie

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on: Jun 24, 2018
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?

Question 2

If the Durbin-Watson statistic d has values smaller than 2, this indicates
 a. a positive first-order autocorrelation
  b. a negative first-order autocorrelation
  c. no first-order autocorrelation at all
  d. None of these choices.


missalyssa26

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Reply #1 on: Jun 24, 2018
Answer to Question 1

n = 240 (using z = 2.58)

Answer to Question 2

A


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