TABLE 11-3
As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of 4 brands of bicycles. She took 3 of each brand and determined their maximum downhill speeds. The results are presented in miles per hour in the table below.
Trial Barth Tornado Reiser Shaw
1 43 37 41 43
2 46 38 45 45
3 43 39 42 46
-Referring to Table 11-3, based on the Tukey-Kramer procedure with an overall level of significance of 0.05, the retailer would decide that the 3 means other than the mean for Tornado are not significantly different from each other.

Question

Quizplus · Accepted Answer

The Tukey-Kramer procedure is used for multiple comparisons of means. In this case, the null hypothesis is that all means are equal, and the alternative hypothesis is that at least one mean is different. Running the Tukey-Kramer procedure with an overall significance level of 0.05, the retailer would compare the differences in means and their standard errors. Based on the results, it would be concluded that the means for Barth, Reiser, and Shaw are not significantly different from each other, but they are significantly different from the mean for Tornado. Therefore, the answer is A.

TABLE 11-3 As Part of an Evaluation Program, a Sporting Goods Retailer