A study is done to see what environmental factors impact plant growth. Plants ar
ID: 3300533 • Letter: A
Question
A study is done to see what environmental factors impact plant growth. Plants are randomly selected to be given either Fertilizer A, Fertilizer B or no fertilizer. Within each of those groups, half are randomly selected to have natural light, while the other half gets artificial light. The growth of the plants after two months are measured and compared. Give the factor(s)(or explanatory variable(s)) for the above situation. b. How many levels are there? c. What is the response variable for the above situation? d. Draw the design for the above situation. Researchers wanted to test whether a new drug therapy results in a more rapid response in patients with major depression. To do this they recruited 63 inpatients with a diagnosis of major depression. Patients were randomly assigned to two treatment groups receiving either placebo (31 patients) or the new drug therapy (32 patients)The response variable was the Hamilton rating scale for Depression score. After collecting and analyzing the data, it was concluded that the new drug-therapy is effective in the treatment of major depression. What type of experimental design is this? What is the population that is being studied?Explanation / Answer
a and b. We have two factor variables. First factor variable is the fertilizer at three levels: fertilizer A, Fertilizer B, and no fertilizer (placebo). Second factor variable is light at two levels: natural light and artificial light.
c. The response variable is the plant growth following two months.
d. It is a completely randomized block design.
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