TABLE 11-6
as Part of an Evaluation Program, a Sporting

question 157

True/False

TABLE 11-6
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.
$$\begin{array} { c c c c c } \hline \text { Trial } & \text { Barth } & \text { Tornado } & \text { Reiser } & \text { Shaw } \\\hline 1 & 43 & 37 & 41 & 43 \\2 & 46 & 38 & 45 & 45 \\3 & 43 & 39 & 42 & 46\end{array}$$
-Referring to Table 11-6, the test is valid only if the population of speeds is normally distributed.

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Definitions:

T-Tests

Statistical tests used to compare the means of two groups to see if there is a significant difference between them.

Type I Error

A Type I Error occurs when a true null hypothesis is incorrectly rejected, also known as a "false positive."

Statistical Power

Statistical power refers to the probability that a statistical test will correctly reject a false null hypothesis, effectively detecting an effect when there is one.

Detecting An Effect

The process of identifying whether a particular treatment, condition, or variable has a statistically significant impact in an experiment or study.