Suppose researchers find that greater alcohol consumption is associated with poorer performance on a skills test. which of the following fictitious correlation coefficients could possibly represent that correlation?

These are the options for the question:

A. -4.57

B. -.47

C. +.91

D. +0.00

The correct answer is:

B. -.47

Explanation:

The Pearson Correlation Coefficient measures the linear correlation between two variables. The value of the coefficient goes form +1, which indicates a perfect positive correlation, to 0, which indicates neutrality or no correlation, to -1, which indiciates a perfect negative correlation.

The question is telling us that the more alcohol a person consumes, the poorer his performance on the test. That means that if one variable goes up (alcohol consumption), the other goes down (performance on the test), therefore, we see a negative correlation. We do not know how strong the negative correlation is, but we know for sure that it is negative.

And the only value among the options for the question that is valid is B) -.47.

While -4.57 is also a negative value, this option is incorrect because the correlation coefficient cannot be less than -1.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

hope this !