One of the steps involved in the processing of corn flakes for cereals involves toasting the flakes. The file CornFlakes contains the following data for corn flakes thickness (mm) for four different toasting times (seconds).

a. At the 0.05 level of significance, is there evidence of a difference in the mean thickness of the corn flakes for the different toasting times?

b. If appropriate, determine which toasting times differ in mean thickness.

c. At the 0.05 level of significance, is there evidence of a difference in the variation in the mean thickness of the corn flakes?

d. Which toasting times differ in thickness of the corn flakes? Explain.

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40sec 60sec 20sec 80sec 1.6 0.6 1.7 2.0 1.2 1.0 1.6 0.8 0.7 0.3 0.7 0.7