If the reliability coefficient for a set of scores is .90, then we know that:
A) 90% of the variance is valid; 10% is reliable
B) 90% of the variance is true; 10% is error
C) 90% of the variance is obtained; 10% is unknown
D) 81% of the variance is true; 19% is error
E) 81% of the variance is unreliable; 19% is reliable
Ans: B
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a. True b. False
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A) testing theories B) formative evaluations C) random selection of subjects D) random assignment to control groups
An anti-bias environment encourages children and adults to
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