For each description below, indicate what research design is being used: ·         To determine if there is a relationship between mood and weather, researchers measure subjects’ moods and the...

For each description below, indicate what research design is being used:

·         To determine if there is a relationship between mood and weather, researchers measure subjects’ moods and the temperature on the day that they complete the mood questionnaire.

·         To examine the effect of temperature on mood, subjects are randomly assigned to a room at 86 degrees or a room at 72 degrees to complete their mood questionnaire.

·         To determine if mood differs by room temperature, a researcher asks two of her classes to fill out a mood questionnaire at the end of class after adjusting the thermostat between classes. She then groups subjects by class and compares their mood scores.