productivity at work and wants to use a correlation coefficient.  However, when the researcher plots the relationship between these two variables, he finds that productivity increases as stress increases to a moderate level and, from that point on, increases in stress are associated with a DECREASE in productivity.  This results in a curved relationship.  This data violates the assumption of: Group of answer choices related pairs interval/ratio measurement a linear relationship between X and Y no outliers in either direction for either variable

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