What is the relationship between main effects and interactions? ____.
a. At least one of the factors involved in the interaction must have a main effect.
b. None of the factors in the interaction can have a main effect.
c. All of the factors involved in the interaction must have main effects.
d. The existence of an interaction is independent of the main effects.
Question 2
If there is not random assignment, but there is a control group and/or multiple measures, a research study can be said to be a(n) _______________.
Fill in the blank(s) with correct word
Post–Main-Sequence Evolution of Low-Mass Stars
Effects of Elevation on Heart Rate and Ventilation
The main avenue to the upward social mobility reviewed in the text has been higher education.
Summary of Parkinson’s disease effects.
Land/Water Interactions
The colinear relationship