If 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 2
A 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.
The Mantoux tuberculin skin test. Positive reaction.
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Identify the variable representing each described quantity in the equation