Question: The article Evaluation of Mobile Mapping Systems for Roadway Data Collection (H. Karimi, A. Khattak, and J. Hummer, Journal of Computing in Civil Engineering, 2000:168-173)

The article "Evaluation of Mobile Mapping Systems for Roadway Data Collection" (H. Karimi, A. Khattak, and J. Hummer, Journal of Computing in Civil Engineering, 2000:168-173) describes a system for remotely measuring roadway elements such as the width of lanes and the heights of traffic signs. For a sample of 160 such elements, the average error (in percent) in the measurements was 1.90, with a standard deviation of 21.20. Let μ represent the mean error in this type of measurement.
a. Find the P-value for testing H0 :μ = 0 versus H1 :μ ( 0.
b. Either the mean error for this type of measurement is nonzero, or the sample is in the most extreme % of its distribution.?

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