A Researcher Wanted to Determine If Using an Octane Booster

question 36

Multiple Choice

A researcher wanted to determine if using an octane booster would increase gasoline mileage. A random
sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks
with the booster.
$$\begin{array} { | l | l | } \hline \text { Miles / Gal Without } & \text { Miles / Gal With } \\\hline 21.2 & 23.8 \\\hline 25.4 & 25.6 \\\hline 20.9 & 22.4 \\\hline 27.6 & 28.3 \\\hline 22.8 & 24.5 \\\hline 27.3 & 28.8 \\\hline 23.4 & 25.2 \\\hline\end{array}$$
-Determine the mean of the difference.

• A) -0.96
• B) -6.3
• C) 1.43
• D) -1.43

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Definitions:

Gene-environment Interactions

The complex interplay between genetic predispositions and environmental factors that influence the expression of genetic traits and behaviors.

Aggressive Behavior

Actions or conduct that manifest hostility, attack, or intent to harm others, physically or verbally.

Group Identification

The psychological process by which individuals align themselves with specific social groups, adopting their norms, values, and behaviors.

Biopsychosocial Organisms

Organisms that are understood through a model considering biological, psychological, and social factors in their health and behavior.