Refer to Applied Example 9.20, “Ceramic Floor Tile,” and Exercise 9.145 to continue the investigation of the floor tile manufacturing process.
a. What are the assumptions for a chi-square test of standard deviation? Do any of the answers in Exercise 9.145 help resolve the assumption requirements?
b. Is there statistical evidence that the process used to manufacture these floor tiles has produced a textured surface that has a standard deviation of surface height no greater than 0.01 inch? State the p-value.
c. Complete the hypothesis test at the 0.01 level of significance; be sure to state your decision and conclusion.
d. What conclusions can be reached about the manufacturing process?

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