A sample of 220 patients of a family medicine practice wassurveyed two weeks after their doctor's visit to ask them whetherthe symptoms that prompted their visit improved, and whether theycomplied with the physician's treatment plan. The following tablecontains the results.
| Symptoms improved | Symptoms did not improve |
| Complied | 100 | 40 |
| Did not comply | 30 | 50 |
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Is there a relationship between the two variables?
| a. | There is no relationship between the variables, because theprobabilities sum up to 1. |
| b. | There is a relationship between the variables, as the columnpercentages are not the same. |
| c. | There is a relationship between the variables because the numberof patients that improved and complied with the treatment plan isgreater than the number that complied and did not improve. |
| d. | We need additional information to determine if there is arelationship between those two variables. |
