A recent article in an educational research journal reports a correlation coeffi

ID: 3294435 • Letter: A

Question

A recent article in an educational research journal reports a correlation coefficient of +0.8 between math

achievement and overall math aptitude. It also reports a correlation coefficient of -0.8 between math

achievement and a math anxiety test. Which of the following interpretations is the most correct?

_________

A) The correlation of +0.8 indicates a stronger relationship than the correlation of -0.8.

B) Math achievement explains 80% of the variance in math aptitude.

C) Math aptitude explains 64% of the variance in math anxiety.

D) For every 1 unit change in math aptitude, the overall math achievement increases by 0.8.

E) None of the above.

Which of the following is true on Power? _________

A) It is the probability of rejecting Ho when it is false

B) It is the probability of not rejecting Ho when it is false

C) It is the probability that Ho is true

D) It is the probability that Ho is false

E) None of the above

Q1) Option E) is correct.

E) None of the above.

Q2) Option A) is correct.

A) It is the probability of rejecting Ho when it is false

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