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Developing Psychological Theories: Mastery Test
1
Select the correct answer.
In which research method does a researcher change the value of one variable to determine how the change affects another variable?
ОА
experiment
B.
observational research
C survey
D. case study
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The correct answer is - А. experiment.

Explanation:

An experiment is a type of research method used for scientific investigation to check how a natural phenomenon works and how a particular variable affected by causing or manipulating one variable.

The affected variable called the dependent variable and the variable that is changed is called the independent variable. Other than independent variables other variables should be controlled so there would be no influence on the result other than independent varibles.

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

the correct answer is b