Author Question: If a researcher runs an ad in a paper in order to recruit subjects, and places the first 10 people ... (Read 43 times)

KWilfred · **on:** Jun 20, 2018

If a researcher runs an ad in a paper in order to recruit subjects, and places the first 10 people who call in one group and the next 10 people who call in another group, what sort of threat to internal validity has been introduced?

a. Mortality
b. Experimenter bias
c. Selection bias
d. Regression effect

Question 2

Because the test itself is not a perfect measure a particular construct, all measurements contain some level of

a. random error
b. maturation
c. regression effect
d. mortality