Instruction 11-3
as Part of an Evaluation Program, a Sporting

question 105

Multiple Choice

Instruction 11-3
As part of an evaluation program, a sporting goods retailer wanted to compare the downhill coasting speeds of four brands of bicycles. She recorded three trials of each brand and determined their maximum downhill speeds. The results are presented in kilometres per hour in the table below.
$$\begin{array} { | l | l | l | l | l | } \hline \text { Trial } & \text { Barth } & \text { Tornado } & \text { Reiser } & \text { Shaw } \\\hline 1 & 43 & 37 & 41 & 43 \\\hline 2 & 46 & 38 & 45 & 45 \\\hline 3 & 43 & 39 & 42 & 46 \\\hline\end{array}$$
-Referring to Instruction 11-3,what should be the conclusion for the Levene's test for homogeneity of variances at a 5% level of significance?

• A) There is not sufficient evidence that the variances are not all the same.
• B) There is sufficient evidence that the variances are all the same.
• C) There is not sufficient evidence that the variances are all the same.
• D) There is sufficient evidence that the variances are not all the same.

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Definitions:

Experimenter Bias

A process where the scientists conducting an experiment influence the results, intentionally or unintentionally, in a direction consistent with their hypothesis.

Ethical

Pertaining to or dealing with morals or the principles of morality; pertaining to right and wrong in conduct.

Natural Experiments

Research designs that involve observing the effects of naturally occurring variables or events, as opposed to manipulations made by the researcher.

Quasi-experiments

Research designs that attempt to establish cause-and-effect relationships but lack the element of random assignment to treatment or control groups.