Cathy,age 45,has Developed a Few Wrinkles on Her Forehead and "Crow's

question 33

Multiple Choice

Cathy,age 45,has developed a few wrinkles on her forehead and "crow's feet" around her eyes.This is primarily due to

• A)age-related contraction of the muscles of the face.
• B)excess pigment accumulation under the skin.
• C)the effects of facial expressions over time.
• D)spending too much time in the sun.

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Definitions:

Covariance

A measure that indicates the extent to which two variables change together; if the greater values of one variable mainly correspond with the greater values of the other variable, and the same holds for the lesser values.

Reject Null Hypothesis

To conclude, based on statistical analysis, that there is enough evidence to support the alternative hypothesis over the null hypothesis in a study.

Covariance

A measure indicating the extent to which two variables change in tandem. It shows whether increases in one variable correspond with increases (positive covariance) or decreases (negative covariance) in the other one.

Pearson Correlation

A measure of the linear correlation between two variables, represented by a value between -1 and 1.