Keegan Notices That His Favorite 55-Cent Candy Bar Seems Lighter

question 59

Multiple Choice

Keegan notices that his favorite 55-cent candy bar seems lighter than usual and so he checks the label to find that it is lighter by ½ ounce. He decides to buy a larger candy bar instead and doesn't notice that the 99-cent candy bar is also ½ ounce lighter. Keegan's behavior illustrates the fact that:

• A) the just noticeable difference is not a reliable measure of psychophysiological judgment.
• B) sensory adaptation may occur in the short time between holding one candy bar and then the other.
• C) difference thresholds are unpredictable because sometimes he can and sometimes he can't detect a ½ ounce change.
• D) the larger a weight is, the greater the change must be before one can detect a difference.

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Definitions:

Normally Distributed

The distribution is noted for its symmetry about the mean, with a higher concentration of data points near the mean and fewer occurrences as the distance from the mean increases.

Explanatory Variables

Variables in a statistical model that are used to explain variation in the response variable; also known as independent variables.

Response Variable

The variable in a study that responds or is presumed to change due to the influence of another variable.

Weakest Correlation

The situation where two variables have the smallest degree of linear relationship between them, often near zero.