Suppose There Is a High Positive Correlation Between Reading Speed

question 38

Multiple Choice

Suppose there is a high positive correlation between reading speed and reading comprehension. You suspect that IQ is a potential third variable. You complete a partial correlation procedure and, with IQ controlled statistically, the high correlation between speed and comprehension virtually disappears. What do you conclude?

• A)IQ is an important third variable affecting the correlation
• B)IQ can be ruled out as a third variable underlying the correlation
• C)IQ must be the cause of the correlation
• D)not enough information to decide

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