The Pearson correlation between X1 and Y is r = 0.50 and the correlation between X2 and Y is r = 0.20. How much variance for the Y scores is predicted by using both X1 and X2 as predictor variables in a multiple regression equation?
A) 0.25 or 25
B) 0.29 or 29
C) 0.70 or 70
D) It cannot be determined from the information given.
Question 2A researcher administers a treatment to a sample of participants selected from a population with = 80. If the researcher obtains a sample mean of M = 88, given the same sample size, which combination of factors is most likely to result in rejecting the null hypothesis?
A) = 5 and = .01
B) = 5 and = .05
C) = 10 and = .01
D) = 10 and = .05
Question 3For either linear regression or multiple regression, the standard error of estimate can be computed as ____.
A) the square root of MSresidual
B) MSresidual/(n - 2)
C) the square root of MSregression
D) MSregression/(n - 2)
Question 4A researcher administers a treatment to a sample of participants selected from a population with = 80. If a hypothesis test is used to evaluate the effect of the treatment, which combination of factors is most likely to result in rejecting the null hypothesis?
A) A sample mean near 80 for a small sample
B) A sample mean near 80 for a large sample
C) A sample mean much different than 80 for a small sample
D) A sample mean much different than 80 for a large sample
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