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You are given this hypothesis: ñif beans are grown in soil with compost, then they will grow at the same rate as beans grown in soil without compost because compost has no effect on the growth rate of beans.î You have access to these supplies and equipment: fifty bean seeds, fifty small pots, potting soil, compost, and grow lights. Write a brief scientific design to test this hypothesis. Include the aspects of good scientific design described in this lesson.

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The beans should be separated into two groups of 25 beans each and potted in the same depth of soil in different pots. Each should be provided with the exact same amount of soil, hours in sunlight, lights and water. 25 of the pots should have compost added to them while the remaining 25 are left without compost. The rate of growth of each plant is then measured per day.
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Answer:

SAMPLE DESIGN AND EVALUATION: Divide plants into two groups of twenty-five. Plant twenty-five seeds in pots with potting soil without compost; this is the control group. Plant the other twenty-five in pots with potting soil and a specific amount of compost added; this is the experimental group. Place the pots under grow lights. After germination, measure the height of the plants at set intervals (e.g., every two days) for a set amount of time (e.g., two weeks). The IV is the presence or absence of compost. The DV is the height of plants. Twenty-five plants per group is a good sample size; all obvious variables are controlled. The experiment is simple and specifically described, so it can be replicated. The seeds were assigned randomly; there is no obvious bias in the experiment.

Explanation:

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