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A group of Birgham Young University Idaho students (Matthew Herring, Nathan Spencer, Mark Walker, and Mark Steiner) collected data in November 2005 on the speed of vehicles traveling through a construction zone on a state highway, where the posted speed was 25 mph. The recorded speed of 14 randomly selected vehicles is given below: (20, 24, 27, 28, 29, 30, 32, 33, 34, 36, 38, 39, 40, 40).

A. Find the z-score for a car driving 20 mph in this construction zone. It is an outlier (assume the data is bell shaped, so dont actually test it with pearsons index).

B. Find the z-score for a car driving 45 mph in this construction zone. It it an outlier(assume the data is bell shaped, so dont actually t est it with pearsons index).

C. Determine the quartiles.

D. Compute the interquartile range, IQR.

E. Determine the lower and upper fences. Are there any outliers, according to this criterion?

Statistics and Probability, Statistics

  • Category:- Statistics and Probability
  • Reference No.:- M9365621

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