The standardized form of the regression equation is zY = (beta)zX. In the equation, what is the value of beta?
A) Beta is equal to the correlation between X and Y.
B) Beta is equal to SP/ SSX.
C) Beta is equal to r/(n - 1).
D) Beta is equal to r/n.
Question 2A two-tailed hypothesis test is being used to evaluate a treatment effect with = .05. If the sample data produce a z-score of z = 2.24, then what is the correct decision?
A) Reject the null hypothesis and conclude that the treatment has no effect.
B) Reject the null hypothesis and conclude that the treatment has an effect.
C) Fail to reject the null hypothesis and conclude that the treatment has no effect.
D) Fail to reject the null hypothesis and conclude that the treatment has an effect.
Question 3If there is a positive correlation between X and Y then in the regression equation, Y = bX + a, ____.
A) b > 0
B) b < 0
C) a > 0
D) a < 0
Question 4A sample of n = 25 individuals is selected from a population with = 80 and a treatment is administered to the sample. What is expected if the treatment has no effect?
A) The sample mean should be very different from 80 and should lead you to reject the null hypothesis.
B) The sample mean should be very different from 80 and should lead you to fail to reject the null hypothesis.
C) The sample mean should be close to 80 and should lead you to reject the null hypothesis.
D) The sample mean should be close 80 and should lead you to fail to reject the null hypothesis.
Question 5For the regression equation, = -2X + 6, if the X value is above the mean (positive deviation), then what can be determined about the predicted Y value?
A) The predicted Y value will be above the mean for the Y scores.
B) The predicted Y value will be below the mean for the Y scores.
C) The predicted Y value will be equal to the mean for the Y scores.
D) It is impossible to determine where the predicted Y value will be.
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