A researcher wants to investigate recovery of verbal skill after a stroke that c

Question

A researcher wants to investigate recovery of verbal skill after a stroke that causes expressive aphasia (inability to speak or write coherently). As a first step, the researcher develops a measure of verbal ability that can be applied quickly in a clinical setting. To validate the scale, the researcher recruits a group of neurologically intact participants and a group of recent stroke survivors who suffer from aphasia. If the scale is valid, it should effectively discriminate between these two groups of people.

What inferential test is being run?

Explanation / Answer

Answer:

A researcher wants to investigate recovery of verbal skill after a stroke that causes expressive aphasia (inability to speak or write coherently). As a first step, the researcher develops a measure of verbal ability that can be applied quickly in a clinical setting. To validate the scale, the researcher recruits a group of neurologically intact participants and a group of recent stroke survivors who suffer from aphasia. If the scale is valid, it should effectively discriminate between these two groups of people.

What inferential test is being run?

We are comparing two groups (group of neurologically intact participants and a group of recent stroke survivors). We have to run independent sample test to compare the two group means.

If the scale is not in the interval or ratio level of measurement, we have to run corresponding nonparametric method, Mann Whitney test.

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