A developmental psychologist is interested in how the activi

A developmental psychologist is interested in how the activity level of four-year-olds is affected by viewing a 30-minute video of SpongBob SquarePants or a 30-minute video of Sid the science kid.

Level #1:

Level #2:

Solution

The levels of the independent (Explanatory) variable are:

Level 1: viewing a 30-minute video of SpongBob SquarePants

Level 2: viewing a 30-minute video of Sid the science kid.