1. A researcher is measuring reaction time (in seconds) on a cognitive task. She randomly assigns each participant into one of three different groups based on the type of images presented during the task (colored, greyscale, or control).

a) Identify the independent variable as well as the type of variable that it is.

b) Identify the dependent variable as well as the type of variable that it is.

c) Identify the type of design that is being employed in this example.