Question

5. You want to conduct an experiment to test the effectiveness of a new fertilizer for...

5. You want to conduct an experiment to test the effectiveness of a new fertilizer for enhancing plant growth.

a. Explain how you would use positive and negative controls to test your new fertilizer.

b. List testable null and alternative hypotheses (one HO and its corresponding HA) you could use in a test for whether your fertilizer was effective at enhancing plant growth. [2 points]

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Answer #1

a.

Positive control: help you determine if the treatments being tested work better than the current standard practice.

Here positive control can be; the plants on which the treatment with new fertilizer is carried out.

Negative control:  helps you determine if the treatments being tested work better than some minimal treatment (or nothing).

Here negative control can be; the plants on which the treatment with new fertilizer is not carried out.

b.

Ho - null hypothesis: The new fertilizer will not enhance plant growth

HA - alternate hypothesis - The new fertilizer will enhance plant growth

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