Immune System Changes That Render Older Adults More Susceptible to Contracting

question 9

Multiple Choice

Immune system changes that render older adults more susceptible to contracting HIV include all of the following except:

• A) Hyper-responsive T cells
• B) Age-related thymic involution
• C) Depletion of naïve CD4 cells
• D) Decline in B cell function

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Definitions:

P-value

A statistical measure indicating the probability of obtaining the observed results, or more extreme, assuming the null hypothesis is true.

ANOVA Table

A table used to summarize the data analysis for an Analysis of Variance, showing sources of variance, degrees of freedom, sum of squares, mean squares, and the F-statistic.

F-ratio

A statistical measure used in ANOVA testing that compares the variances between groups to variances within groups.

P-value

A statistic that measures the probability of obtaining test results at least as extreme as the results actually observed, assuming that the null hypothesis is correct.