Deck 14: Correlational Studies

Question 1

Direct age adjustment requires knowing the exposure or disease rates by age group in each population.

Answer 1

True

Question 2

Correlational studies are a useful starting point for generating hypotheses about associations, but they are not the final word on risk factors for a disease.

Answer 2

True

Question 3

Before conducting a statistical analysis of aggregate data, the data from each population must be entered into which of the following?

A) Histogram
B) Matrix
C) Scatterplot
D) Spreadsheet

Answer 3

D

Question 4

On a scatterplot used to illustrate correlation, when the points are not exactly linear but a line for trend can be drawn through them, the correlation is said to be which of the following?

A) Strong
B) Moderate
C) Weak
D) Nonexistent

Question 5

For continuous variables and other variables with responses that can be plotted on a number line, which of the following is used to calculate the correlation?

A) Pearson correlation coefficient
B) Spearman rank-order correlation
C) Kendall's rank-order correlation
D) Linear regression models