According to the textbook, the average correlation between rated attractiveness of members of a couple should be _____ if it is truly the case that people tend to be romantically involved with someone of equivalent attractiveness.

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If people tend to be romantically involved with someone of equivalent attractiveness, we would expect a positive correlation, indicating that as one person's attractiveness increases, so does their partner's. A correlation of +.50 suggests a moderate positive relationship, which aligns with the idea of equivalent attractiveness.

According to the Textbook, the Average Correlation Between Rated Attractiveness