# Question: Refer to Applied Example 9 20 Ceramic Floor Tile on page

Refer to Applied Example 9.20, “Ceramic Floor Tile,” on page 461. First you need to complete a preliminary investigation of the 26 randomly selected surface heights:

a. Present and describe the sample of surface heights using a histogram, the mean, and the standard deviation.

b. Check the surface heights for a normal distribution. State what you believe to be the case based on the results found in part a. Further, find additional statistical evidence. Very precisely state your conclusion regarding normality for the distribution of this variable. Statistical testing of the manufacturing process:

c. Is there statistical evidence that the process used to manufacture these floor tiles has produced a textured surface that has a mean surface height no greater than 0.025 inch? State the p-value.

d. Complete the hypothesis test at the 0.01 level of significance; be sure to state your decision and conclusion.

a. Present and describe the sample of surface heights using a histogram, the mean, and the standard deviation.

b. Check the surface heights for a normal distribution. State what you believe to be the case based on the results found in part a. Further, find additional statistical evidence. Very precisely state your conclusion regarding normality for the distribution of this variable. Statistical testing of the manufacturing process:

c. Is there statistical evidence that the process used to manufacture these floor tiles has produced a textured surface that has a mean surface height no greater than 0.025 inch? State the p-value.

d. Complete the hypothesis test at the 0.01 level of significance; be sure to state your decision and conclusion.

## Answer to relevant Questions

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 ...How important is the assumption "the sampled population is normally distributed" for the use of the chi-square distributions? Use a computer and the two sets of MINITAB commands that can be found in the Student Solutions ...The total cost of required textbooks for nine freshman- or sophomore-level classes at 10 randomly selected New York private colleges was collected: a. Construct a histogram and find the mean and standard deviation. b. ...The marketing research department of an instant coffee company conducted a survey of married men to determine the proportion of married men who prefer their brand. Of the 100 men in the random sample, 20 prefer the ...You are interested in comparing the null hypothesis p = 0.8 against the alternative hypothesis p = 0.8. In 100 trials you observe 73 successes. Calculate the p-value associated with this result.Post your question