Counterbalanced designs
a. give the same treatments to all subjects.
b. may involve many groups and treatments.
c. rotate intact groups.
d. a and c
e. All of these are true.
Question 2
If the reliability coefficient for a set of test scores is .90, we know that
a. 90 of the variance is true variance; 10 is unknown.
b. 90 of the variance is true variance; 10 is error.
c. 90 of the variance is true variance; 10 is reliable.
d. 81 of the variance is true variance; 19 is error.
e. 81 of the variance is true variance; 19 is unknown.
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