Author Question: One basic purpose of experimental design is A) to reduce the number of participants needed. B) ... (Read 86 times)

jilianpiloj · **on:** Aug 4, 2018

One basic purpose of experimental design is

A) to reduce the number of participants needed.
B) to control variance.
C) to keep the alpha level below .05.
D) to observe contingencies.

Question 2

In order to study causal relationships,

A) the null hypothesis must not be rejected.
B) external validity is essential.
C) we must use a t-test or F-test.
D) there must be variation of the independent variable.