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, the test is valid only if the population of speeds is normally distributed.

Question

Quizplus · Accepted Answer

In order to make valid statistical inferences, the data must meet certain assumptions. One of the key assumptions for many statistical tests is that the population from which the sample is drawn is normally distributed. Therefore, in this case, the test is valid only if the population of speeds is normally distributed.

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