Identify the independent, dependent and controlled variables:
a)Does the activity of soil affect plant growth?
Independent:
Dependent:
Controlled:
b)Does getting a good night's sleep affect performance on a test?
Independent:
Dependent:
Controlled:
http://www.sciencebuddies.org/science-fair-projects/project_variables.shtml
a) In the question "Does the activity of soil affect plant growth?", the variables can be identified as follows:
Independent variable: The activity of soil. This is the variable that is being manipulated or changed in the experiment. In this case, it refers to the level of activity or the presence of certain factors in the soil that may influence plant growth.
Dependent variable: Plant growth. This is the variable that is being measured or observed as a result of the changes in the independent variable. In this case, it refers to the growth or health of the plants.
Controlled variables: These are the variables that are kept constant or controlled during the experiment to minimize their influence on the dependent variable. In this case, examples of controlled variables could include factors like temperature, light conditions, amount of water provided to the plants, etc.
b) In the question "Does getting a good night's sleep affect performance on a test?", the variables can be identified as follows:
Independent variable: Getting a good night's sleep. This is the variable that is being manipulated or changed in the experiment. It refers to the quality and duration of sleep the participants have before taking the test.
Dependent variable: Performance on a test. This is the variable that is being measured or observed as a result of the changes in the independent variable. It refers to the scores or outcomes of the test, such as the number of correct answers or overall performance.
Controlled variables: These are the variables that are kept constant or controlled during the experiment to minimize their influence on the dependent variable. In this case, examples of controlled variables could include factors like the difficulty level of the test, the time allotted for the test, the test-taking conditions, etc.