Chapter 9: Q19E (page 542)
Refer to Exercises 9.17 and 9.18. Complete the following ANOVA table for each of the two dot plots:
The F-ratio for dot plot #1 is 37.5 and for dot plot #2 is 5.21
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Why does the experiment wise error rate of a multiplecomparisons procedure differ from the significance level for each comparison (assuming the experiment has more than two treatments)?
Evaluation of flexography printing plates. Refer to the Journal of Graphic Engineering and Design (Vol. 3, 2012) study of the quality of flexography printing, Exercise 9.24 (p. 544). Recall that four different exposure times were studiedโ8, 10, 12, and 14 minutesโand that the measure of print quality used was dot area (hundreds of dots per square millimeter). Tukeyโs multiple comparisons procedure (at an experimentwise error rate of .05) was used to rank the mean dot areas of the four exposure times. The results are summarized below. Which exposure time yields the highest mean dot area? Lowest?
Performance of a bus depot. Refer to the International Journal of Engineering Science and Technology (February 2011) study of public bus depot performance, Exercise 9.25 (p. 544). Recall that 150 customers provided overall performance ratings at each of three different bus depots (Depot 1, Depot 2, and Depot 3). The average performance scores were determined to be significantly different at ฮฑ=.05 using an ANOVA F-test. The sample mean performance scores were reported as 
. The researchers employed the Bonferroni method to rank the three performance means using an experiment wise error rate of .05. Adjusted 95% confidence intervals for the differences between each pair of treatment means are shown in the table. Use this information to rank the mean performance scores at the three bus depots.
Identify whether the following levels of factors are qualitative or quantitative.
a. Method of payment (cash, check, and credit card)
b. Hotel service rating (1 for Fair, 2 for Average, 3 for Good, and 4 for Excellent)
c. Percentage return on investment (1%, 5.5%, and 8.3%)
d. Time taken to complete a car race (22 minutes, 25 minutes, and 29 minutes)
e. Number printed on the back of a football jersey (1, 2, 3, etc.)
Explain the difference between an experiment that employs a completely randomized design and one that employs a randomized block design.
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