What correlation coefficient value indicates the "Friend" measure has good discriminant validity?
A researcher was interested in developing a reliable and valid measure of friendliness. That is, she wanted to distinguish between friendly and unfriendly people using her questionnaire. To determine whether she developed a good measure (called "Friend"), she administered her "Friend" questionnaire to a group of 300 people twice (Friend-Time 1 and Friend-Time 2), separated by six months. At the second testing session she also administered a similar questionnaire called "Nice," which previous research has shown to be a valid measure of people's ability to get along with people and to make friends. She also administered a questionnaire designed to measure art ability, which she predicted to be unrelated to friendliness. She observed the following correlations among the measures:
The correlation between Friend and Art Ability is .10.
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Joey's mother was amazed by her two-year-old son. He was a very friendly, agreeable child who always seemed to be relaxed and in a good mood. Thomas and Chess would describe Joey as a(n) __________ child
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