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Chapter 2: Problem 44

You have decided to test the effects of five garden fertilizers by applying some of each to five separate rows of radishes. What is the variable you are testing? What factors should you control? How will you measure the results?

Short Answer

Expert verified
The variable being tested is the type of garden fertilizer used. Control variables might include sunlight, water intake, type of radish seed, and soil condition before fertilizer application. Results could be measured by tracking the radishes' physical characteristics over time and observing qualitative changes.

Step by step solution

01

Identify the Variable Being Tested

In an experiment, the variable being tested is the element that is manipulated to see if it causes a change. In this case, the variable being tested is the type of garden fertilizer. Each of the five garden fertilizers is applied to their separate rows of radishes to observe for any changes.
02

Identify Factors to Control

Control factors are elements that could also affect the plant's growth but are not being observed for effects. They are maintained constant to prevent interference with the results. Factors to be controlled when testing different fertilizers include water intake, sunlight exposure, type of radish seeds used, gardening care, and the soil's condition before any fertilizer is added.
03

Measure the Results

To enable valid results to be derived, a consistent and objective method of measure must be established. In this case, radish growth could be measured quantitatively by tracking height, width, and mass (i.e., the plant’s physical characteristics) over a period, and qualitatively by noting the color, health of leaves, and other observable changes.

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