DrJones Is Interested in Studying How Indoor Lighting Can Influence

question 46

Multiple Choice

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 is

• A)the brightness of the lights.
• B)the level of depression.
• C)the houses with 100-watt bulbs.
• D)the houses with 60-watt bulbs.

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