In a laboratory experiment, John tested participants with a test of free recall

Question

In a laboratory experiment, John tested participants with a test of free recall for lists of words. He gave his participants 12 lists of 20 words each, and after each list asked them to type as many words as they could remember. His measurement of memory (dependent variable) is the percentage of words recalled from all of the lists.

You may choose from these validities to answer the questions

1a.) John compared his free recall scores with scores from a recognition memory test and found a nice positive correlation between the two sets of scores. What kind of validity did this examine?

1b.) John compared his free recall scores with scores on a test of fine motor skill (ability to manipulate small objects). Looking at a scatterplot of the two sets of scores, he found there was basically no relationship. What kind of validity did this examine?

1c.) Some of Johns participants had been previously diagnosed with varying degrees of Alzheimer's disease (a memory disorder). He compared the scores on his free recall test across the different levels (groups) of people with Alzheimer's, and found that people with more severe Alzheimer's performed more poorly on the free recall test.What kind of validity does this assess?

Explanation / Answer

Answer:

1a: Internal Validity

Explaination: If a test has internal validity it means that the effect that has been observed are solely due to the manupilation of independent variable and not because of the some other factor.

1b: Discriminant validity

Explaination: if a test has discriminant validity it means that the measures which should not be related are actually not related

1c: Criterion Validity

Explaination: If a test has criterion validity it means that the how well one measure predicts the outcome for another measure.

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