Dr. jones is interested in studying how indoor lighting can influence people's moods during the winter. a sample of 100 households is selected. fifty of the homes are randomly assigned to the bright-light condition where dr. jones replaces all the lights with 100-watt bulbs. in the other 50 houses, all the lights are changed to 60-watt bulbs. after two months, dr. jones measures the level of depression for the people living in the houses. in this study, the independent variable

the brightness of the lights.

Explanation:

Independent variable: In a psychological experiment, the independent variable is one that is being changed or manipulated. The experimenter has the authority to change and control the independent variable and it possesses a direct effect on the dependent variable in a given experiment.

Example: The independent variable is best described in terms of time and age.

In this study, the independent variable is the brightness of the lights.

i dont know this man

there are indirect ways of affecting state laws   by with holding funding's. and that's why we have a 55mph speed on the high way with a design of 70mph speed.