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An experiment is a controlled study in which the researcher manipulates one or more variables to observe the effect on another variable. In this case, the biologist is manipulating the type of fertilizer (organic vs non-organic) and observing the effect on the Show more…
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A biologist assumes that there is a linear relationship between the amount of fertilizer supplied to an apple plant and the subsequent yield of apples obtained. Eight apple plants of the same variety were selected at random and treated weekly with a solution in which x grams of fertilizer were dissolved in a fixed quantity of water. The yield Y in kilograms for each plant is as follows: Plant A B C D E F G H X 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 Y 3.9 4.4 5.8 6.6 7.0 7.1 7.3 7.7 (a) Plot a scatter diagram of yield Y against the amount of fertilizer x. (b) Calculate the least square regression line of Y on x and also X on Y, and explain the line. (c) Estimate the yield of a plant treated weekly with 3.5 grams of fertilizer. (d) Find the spearman correlation coefficient.
David M.
A researcher is interested in testing the effects of different fertilizers. The researcher applied 5 different fertilizer formulas to three different types of seeds. The average number of days it took the seeds to grow 12 inches was recorded. The researcher will use a significance level of alpha = .05. | | Fertilizer 1 | Fertilizer 2 | Fertilizer 3 | Fertilizer 4 | Fertilizer 5 | | :--- | :--- | :--- | :--- | :--- | :--- | | Seed A | 106 | 95 | 94 | 103 | 100 | | Seed B | 110 | 98 | 11 | 108 | 105 | | Seed C | 94 | 86 | 98 | 99 | 94 | | Source of Variation | df | F | P-Value | | :--- | :--- | :--- | :--- | | Seed | 2 | 28.30 | 0.000008 | | Fertilizer | 5 | 12.39 | 0.000119 | | Interaction | 15 | 1.97 | 0.122090 | a. Is there a significant difference in plant growth among the three seed types? If so, is a follow-up test needed for further investigation? Explain. b. Is there a significant difference in growth among the different fertilizers? Explain. If so, is a follow-up test needed for further investigation? Explain. c. Do the fertilizers affect the seed types differently? Explain your answer.
Adi S.
1. An ecologist studying desert plants performed the following experiment. She staked out two identical plots that included a few sagebrush plants and numerous small annual wildflowers. She found the same five wildflower species in similar numbers in both plots. Then she enclosed one of the plots with a fence to keep out kangaroo rats, the most common herbivores in the area. After two years, four species of wildflowers were no longer present in the fenced plot, but one wildflower species had increased dramatically. The unfenced control plot had not changed significantly in species composition. Using the concepts discussed in the chapter, what do you think happened? 2. Imagine that you have been chosen as the biologist for the design team implementing a self-contained space station to be assembled in orbit. It will be stocked with the organisms you choose, creating an ecosystem that will support you and fiver other people for two years. Describe the main functions you expect the organisms to perform. List the types of organisms you would select, and explain why you chose them.
Rupsa S.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
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