The primary reason that confounding variables pose problems for researchers is because they tend to Group of answer choices be difficult to explain scientifically. be difficult to measure. vary in magnitude. vary along with one another.

vary along with one another.

Explanation:

Confounding variable is a term in research methodology that describes a form of an additional variable that the researcher did not prepare for.

In other words, it is considered as an external influence that alters the effect of a dependent and independent variable. For example, the weather could be considered as a confounding variable that may change the effect of the experiment design.

However, because confounding variables vary along with one another, they have the tendency to ruin an experiment and lead to worthless results. They can also initiate bias.

Hence, the primary reason that confounding variables pose problems for researchers is that they tend to VARY ALONG WITH ONE ANOTHER.

b. the american revolution

answer; taking detailed notes during the interview;