Albert Michelson, the first American citizen to be awarded a Nobel Prize in Physics, conducted many experiments

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Albert Michelson, the first American citizen to be awarded a Nobel Prize in Physics, conducted many experiments in determining the velocity of light in air. Following is an excerpt of five trials of 20 measurements each taken by Michelson from June 5 to July 2, 1879.

The measurements have had 299,000 subtracted from them.

Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 850 960 880 890 890 740 940 880 810 840

••• Remainder of data on Student’s Suite CD-ROM Source: http://lib.stat.cmu.edu/DASL/Stories/SpeedofLight.html

a. Construct a boxplot showing the five trials side by side. What does this graph suggest?

b. Using a one-way ANOVA, test the claim that not all trial results were the same. Use a level of significance of 0.05.

c. What conclusions might you draw from the results of the hypothesis test?

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