Author Question: In a within-subjects research study, factors that change over time, such as history and maturation, ... (Read 161 times)

natalie2426 · **on:** Jun 19, 2018

In a within-subjects research study, factors that change over time, such as history and maturation, can be threats to ____.

a. internal validity only
b. external validity only
c. both internal and external validity
d. neither internal nor external validity

Question 2

A(n) ____ is usually developed to measure an abstract concept like an attitude.

a. index
b. instrument
c. test
d. scale