Author Question: The statement variation is necessary to carry out experiments A) is true only in experiments ... (Read 134 times)

Diane · **on:** Aug 4, 2018

The statement variation is necessary to carry out experiments

A) is true only in experiments involving human participants.
B) is not true in nearly 30 of all experimentation.
C) refers only to the importance of having very different participants in each group.
D) is always true in experiments of any kind.

Question 2

A clear experimental design should be developed

A) before making any observations.
B) after observations have been made.
C) at the data collection phase.
D) before beginning to review literature in the area.