Surveys can give useful information about a population if a random sample of people complete the survey. But the information may be biased if only a small percentage of the sample actually return the survey. Will more people complete a survey if they are paid? In this study researchers examine the relationship between monetary incentive and the percentage of the sample who complete the survey.

1. The direction of the relationship is Select an answer positive negative neither positive nor negative
2. When researchers promised higher payments, the percentage of participants who completed the survey Select an answer decreased increased remained the same
3. The form of the relationship is Select an answer neither linear nor curvilinear curvilinear linear
4. Based on the form of the relationship, the relationship is quite Select an answer strong weak
5. The point (50,64) is NOT an outlier with respect to Select an answer incentive form and direction of relationship percentage returned