An experiment is done to test the effect of artificial light on geraniums Seventy-five geranium seedlings are grown in a laboratory The plants are separated into five groups of 15 plants each. The following table shows the groups, how much light each receives per day, and the average height of the plants after 180 days in the laboratory. All plants are fed the same amount of water and fertilizer daily Group 4 receives as much light as all the other plants in the laboratory, which are not part of the experiment. Thus 16 hours is average Groups 1 to 3 receive less light than average, and Group 5 receives more light than average.

Using this information, Answer the following a. What is the hypothesis being tested? b. What is the dependent variable? c. What are the independent variables? d. Which variables are controlled? e. Which is the control group? f. Did the experiment produce data that supports the hypothesis?

Group # 1 2 3 4 5 Hours of Light per Day 3 6 12 16 24 Height at 180 Days 5.0 cm 14.5 cm 29.2 cm 36.1 cm 25.4 cm