CHI-SQUARE OF INDEPENDENCE ON RELATIONSHIP

1. A study is being conducted to determine whether there is a relationship between jogging and blood pressure. A random sample of 210 subjects is selected, and they are classified as shown in the table. At a = 0.05, test the claim that jogging and blood pressure are not related. Blood Pressure Jogging Status Low Moderate High Joggers 34 57 21 Nonjoggers 15 63 20 2. A researcher who wants to see if there is a relationship between working and grades collects the following data: Hours of work A B D/F 20+ 8 5 DO WO 10 - 20 12 4 Less than 10 20 10 With a = 0.05, can the researcher claim working and grades are independent