If more participants drop out of one of the levels of your independent variable than a second level, you may have a problem with mortality as a threat to internal validity.
Indicate whether the statement is true or false
Question 2
Suppose you have two levels of your independent variable and you assign participants to the levels by asking them to volunteer for one of the levels, the threat to external validity that you should be most concerned with is maturation.
Indicate whether the statement is true or false
Parental warmth, monitoring, and granting of appropriate levels of autonomy are associated with ...
Surface Fronts and Upper-Level Patterns: Cold Fronts and the Formation of Upper-Level Troughs
Levels of Ecological Organization
How much voltage does the resistor drop in Figure 10-2?
Summary of Single Variable Discrete Models
Animated Changes in the ovary and uterus correlated with changing hormone levels. We start with the