Which of the following terms in correlational research mean the ...

[Anajune7]

Which of the following terms in correlational research mean the same thing? (Select all that apply.)
 
  a. Predictor variable
  b. Dichotomous variable
  c. Dependent variable
  d. Multicollinearity
  e. Independent variable

Question 2

Why does a researcher decide to calculate odds ratio instead of calculating linear regression when comparing whether a person voted in the last election and the person's gender?
 
  a. Voting records are sealed.
  b. Both predictor and dependent variable are dichotomous.
  c. Odds ratio is a simpler calculation.
  d. Strength of relationship is not an issue.

[briezy]

Answer to Question 1

ANS: A, E
The independent (predictor) variable or variables are identified as being predictive of variation in the value of the dependent (outcome) variable. Multicollinearity refers to highly correlated predictor variables that are difficult to tease out from one another. A dichotomous variable has only two possible values.

Answer to Question 2

ANS: B
When both the predictor and the dependent variable are dichotomous (having only two values; also called binary), the odds ratio is a commonly used statistic to obtain an indication of association. Linear regression is used to determine relationships with interval or ratio data. The odds ratio (OR) is defined as the ratio of the odds of an event occurring in one group to the odds of it occurring in another group. Put simply, the OR is a way of comparing whether the odds of a certain event is the same for two groups.

[Anajune7]

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