Dr. Ingram deliberately varied the imageability of items on a list and later measured participants' recall of the items. Dr. Ingram conducted a(n) _____ study.
a) correlational
b) naturalistic
c) experimental
d) observational

An experimental study is that in which the variables are in direct control of the researcher. He/she is in control of changing or adjusting them in order to reach an outcome.

Dr. Ingram varied the imageability of items on a list to measure the participants' recalling abilities. He is conducting an experimental study.

Let's see why the other options are not valid in this case:

A correlational study tries to find correlations between 2 or more variables.
In a naturalistic study the researcher observes a certain phenomenon.
An observational study just centers on observing, there is no manipulation of variables.

Dr. Ingram deliberately varied the imageability of items on a list and later measured participants' recall of the items. Dr. Ingram conducted a(n) _____ study. a) correlational b) naturalistic c) experimental d) observational

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Dr. Ingram deliberately varied the imageability of items on a list and later measured participants' recall of the items. Dr. Ingram conducted a(n) _____ study.
a) correlational
b) naturalistic
c) experimental
d) observational