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.
B
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