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.

The direction of this relationship is [ Select ] ["postive", "negative", "neither positive nor negative"] .

In the context of this example, this means that when researchers promised higher payments, the percentage of participants who completed the survey [ Select ] ["increased", "remained the same", "decreased"] .

The form of the relationship is [ Select ] ["linear", "curvilinear", "neither linear nor curvilinear"] .

Based on the form of the relationship as it is illustrated above, the relationship is quite [ Select ] ["strong", "weak"] .

The point (50, 64) is NOT an outlier with respect to [ Select ] ["Incentive", "Percentage returned", "Form and direction of the relationship"] .