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# IHP 525 Quiz Four Answer the following questions covering materials from previous chapters in your textbook. Each question is worth 2.5 points. A...

Evidence of nonrandom differences in group means occurs when the variance between groups is __________ the variance within groups.Why are scatterplots necessary when investigating the relationship between quantitative variables?r is always greater than or equal to _____ and less than or equal to _____. Perfect negative association is present when r = _____. Perfect positive association is present when r = _____. Between r = -0.56 and r = +0.46, the stronger correlation is _____.Besides linearity, what conditions are needed to infer population slope β (3 more conditions)? Besides linearity, what conditions are needed to infer population correlation coefficient ρ (2 more conditions)?