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.
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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