How Does Normal Aging Change the Immune System

question 7

Multiple Choice

How does normal aging change the immune system?

• A) Depresses bone marrow.
• B) T cells become hyperactive.
• C) B cells show deficiencies in activity.
• D) Increase in the size of the thymus.

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Definitions:

F-Ratio

The F-ratio is a statistic used to compare the variance between groups with the variance within groups in analysis of variance (ANOVA) testing.

Factor A

A variable manipulated by the researcher in an experiment to observe its effect on the dependent variable; often used in the context of factorial designs.

MSA

An abbreviation for Metropolitan Statistical Area, which is a geographical region with a relatively high population density at its core and close economic ties throughout the area.

Critical Value

A point on the scale of a test statistic beyond which the null hypothesis is rejected in favor of an alternative hypothesis.