(Same experiment as in 1.4) Investigators are interested in the relationship bet

Question

(Same experiment as in 1.4) Investigators are interested in the relationship between sleep apnea and Alzheimer’s disease. In order to more thoroughly understand the relationship, these investigators decide to recruit 50 participants with Alzheimer’s and 50 participants without Alzheimer’s, and look at their history of sleep apnea. For this study, the variables are:

a. Explanatory variable: history of sleep apnea; and outcome: Alzheimer’s status

b. Explanatory variable: with sleep apnea; and outcome: without sleep apnea

c. Explanatory variable: Alzheimer’s status; and outcome: history of sleep apnea

d. Explanatory variable: with Alzheimer’s; and outcome: without Alzheimer's

Explanation / Answer

An explanatory variable is a type of independentvariable. The two terms are often used interchangeably. But there is a subtle difference between the two. When a variable is independent, it is not affected at all by any other variables. When avariable isn't independent for certain, it's anexplanatory variable.

So,

a. Explanatory variable: history of sleep apnea; and outcome: Alzheimer’s status

is the answer

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