A Researcher Wants to Examine the Effect of Fertilizer and the Effect

question 45

Multiple Choice

A researcher wants to examine the effect of fertilizer and the effect of sunlight on the yield of tomatoes.She bought 60 tomato plants at a local garden store.She randomly assigned 30 tomato plants to be planted on the sunny side of the hill and 30 to be planted on the shady side.The 30 plants which are planted on the shady side are randomly assigned to one of three groups.The first group are grown with no fertilizer,the second group with a small amount of fertilizer,and the third group with a large amount of fertilizer.The 30 plants which are planted on the sunny side are likewise randomly assigned to one of three groups.The first group are grown with no fertilizer,the second group with a small amount of fertilizer and the third group with a large amount of fertilizer.All tomato plants are planted at the same time and are all treated alike (in terms of how much they are watered,weeded etc) .Each plant is grown to maturity.The total weight of tomatoes obtained from each plant is recorded.Identify the factor(s) and the number of levels for each.

• A)Fertilizer (3 levels),location (2 levels)
• B)No fertilizer and sunny,small amount of fertilizer and sunny,large amount of fertilizer and sunny,no fertilizer and shady,small amount of fertilizer and shady,large amount of fertilizer and shady (6 levels)
• C)No fertilizer,small amount of fertilizer,large amount of fertilizer (3 levels)
• D)Sunny,shady (2 levels)
• E)Fertilizer (3 levels),blocking variable - location (2 levels)

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Definitions:

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A small region of the brain in the hypothalamus, responsible for controlling circadian rhythms.

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A major part of the central nervous system which extends from the base of the brain through the vertebral canal and is responsible for transmitting nerve signals between the brain and the rest of the body.

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