15.A research method in which
researchers systematically alter one or
more variables is called:
a. Experimental method
b. Research method
c. Co-relational method
d. All of them
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research method. mark as brainliest
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A research method in which researchers "systematically alter one or more variables" is called Co-relational method.
Explanation:
Correlation research is a kind of no experimental investigation in which the specialist estimates two variables and surveys the factual relationship (i.e., the connection) between them with practically no push to control incidental factors.
They initially study the variables separately, and then they study it in combined form. After to this, they alter the variables one by one and correlate the result with each other.
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