Identify the dependent and independent variables in the following experiments.
1. Height of bean plants is recorded daily for 2 weeks.
2. Percent absorption by a pigment is measured for red, blue, green, and yellow wavelengths of light.
My thought process:
1.
a. Dependent: Height of bean plants
b. Independent: Types of bean plants
2.
a. Dependent: Percent absorption
b. Color of the light wavelengths
1a. Correct
1b. Although you may be right, your data has no indication that different varieties of bean plants are being used.
2a. Right.
2b. wavelengths
Yes second answer is correct.
1.
a. Dependent variable: Height of bean plants - This is the variable that will be measured or observed in response to changes in the independent variable(s).
b. Independent variable: Time - This is the variable that will be manipulated or changed in order to observe its effect on the dependent variable.
2.
a. Dependent variable: Percent absorption - This is the variable that will be measured or observed in response to changes in the independent variable(s).
b. Independent variable: Wavelengths of light (red, blue, green, and yellow) - This is the variable that will be manipulated or changed in order to observe its effect on the dependent variable.
Your thought process is almost correct, but let me explain the correct identification of dependent and independent variables in the given experiments.
1. In the experiment measuring the height of bean plants daily for 2 weeks:
a. Dependent variable: Height of bean plants. This is the variable that is being measured and is expected to change as a result of the experiment.
b. Independent variable: Time (or days). This is the variable that is being manipulated or controlled by the researcher. In this case, the researcher is measuring the height of the bean plants at different points in time, making time the independent variable.
2. In the experiment measuring percent absorption by a pigment for different light wavelengths:
a. Dependent variable: Percent absorption. This is the variable that is being measured and is expected to change as a result of the experiment.
b. Independent variable: Color of the light wavelengths. This is the variable that is being manipulated or controlled by the researcher. The researcher is measuring the percent absorption for different colors of light, making the color of the light wavelengths the independent variable.