The Mean Length of a Candy Bar Is 43 Millimeters

question 42

Multiple Choice

The mean length of a candy bar is 43 millimeters. There is concern that the settings of the machine
Cutting the bars have changed. Test the claim at the 0.02 level that there has been no change in the
Mean length. The alternate hypothesis is that there has been a change. Twelve bars (n = 12) were
Selected at random and their lengths recorded. The lengths are (in millimeters) 42, 39, 42, 45, 43,
40, 39, 41, 40, 42, 43, and 42. Has there been a statistically significant change in the mean length of
The bars?

• A) Yes, because the computed t lies in the rejection region.
• B) No, because the information given is not complete.
• C) No, because the computed t lies in the area to the right of -2.718.
• D) Yes, because 43 is greater than 41.5.

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Definitions:

Evolved Preference

Preferences or inclinations shaped by evolutionary processes that have become hardwired into the human psyche, often related to survival or reproduction.

Cultural Phenomenon

Events, practices, or objects that are widely recognized and significant within a particular culture or society.

Individual Differences Variable

A variable that captures the variations among individuals in their behaviors, traits, or characteristics.

Reinforcement Theory

A theory in psychology that suggests that behavior is motivated by its consequences, with positive outcomes encouraging the behavior and negative outcomes discouraging it.