You obtained robs= +.39 when correlating the number of hours per week spent studying by a student and his or her grade point average. In order to find if this correlation coefficient is statistically significant, you need to know the _____ .
a. means for both variables
b. standard deviation for both variables
c. number of pairs of scores on which robs was based
d. CPXY for this correlation
Question 2
The dilemma facing the experimenter is determining how large a difference between the
sample means is enough to decide that something other than _____ is at work in the
experiment.
a. the independent variable
b. a treatment effect
c. sampling error
d. systematic variation
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