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Chapter 2: Problem 12

What is a control? What is a variable?

Short Answer

Expert verified
A 'Control' in a scientific experiment is a standard of comparison or a baseline that isn't changed or manipulated, so you can see the effects of changing other factors. A 'Variable' in a scientific experiment is a factor that can change or be changed, affecting the results of the experiment.

Step by step solution

01

Define the term 'Control'

In the context of scientific experiments, a 'Control' is a standard of comparison in an experiment. It's the group or setup that you don't apply any changes or treatments to. This is so you can see what happens when you change other factors. It provides a baseline that lets you see the effects of what you're testing.
02

Define the term 'Variable'

A 'Variable' in a scientific experiment is an element, feature, or factor that can change or be changed. It can affect or influence the results of an experiment. There are different types of variables: Independent Variables (the factor that the researcher manipulates), Dependent Variables (the factor that changes in response to the Independent Variable), and Controlled Variables (factors that are kept the same to ensure that the experiment is fair and the results are valid).

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Most popular questions from this chapter

Graphing Celsius and Fahrenheit Temperatures The graphing calculator can run a program that makes a graph of a given Fahrenheit temperature (on the \(x\) -axis) and the corresponding Celsius temperature (on the \(y\) -axis). You can use the TRACE button on the calculator to explore this graph and learn more about how the two temperature scales are related. Go to Appendix c. If you are using a TI-83 Plus, you can download the program CELSIUS and run the application as directed. If you are using another calculator, your teacher will provide you with keystrokes and data sets to use. After the graph is displayed, press TRACE. An X-shaped cursor on the graph line indicates a specific point. At the bottom of the screen the values are shown for that point. The one labeled \(\mathrm{X}=\) is the Fahrenheit temperature and the one labeled \(\mathrm{Y}=\) is the Celsius temperature. Use the right and left arrow keys to move the cursor along the graph line to find the answers to these questions. a. What is the Fahrenheit temperature when the Celsius temperature is zero? (This is where the graph line crosses the horizontal \(x\) -axis. What is the significance of this temperature? b. Human internal body temperature averages \(98.6^{\circ} \mathrm{F.}\) What is the corresponding value on the Celsius scale? c. Determine the Fahrenheit temperature in your classroom or outside, as given in a weather report. What is the corresponding Celsius temperature? d. At what temperature are the Celsius and Fahrenheit temperatures the same?

Express 743000000 in scientific notation to the following number of significant figures: a. one significant figure b. two significant figures c. four significant figures

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?

How many significant figures does the answer to \(\left(1.36 \times 10^{-5}\right) \times\left(5.02 \times 10^{-2}\right)\) have?

Why is it important to keep track of significant figures?
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