Assume that the following correlations were obtained ' in a study: .5 1 between level of aspiration and academic achievement; .40 between social class and academic achievement; .30 between level...

Assume that the following correlations were obtained ' in a study: .5 1 between level of aspiration and academic achievement; .40 between social class and academic achievement; .30 between level of aspiration and social class.

(a) Suppose you wish to determine the correlation between level of aspiration and academic achievement after controlling for social class. What is the correlation?

(b) Assume that the reliability of the measurement of social class is .82. What is the correlation between level of aspiration and academic achievement after controlling for social class and correcting for the unreliability of its measurement? Interpret the results.