page 04 4. Which of the following are null hypotheses? 1. Blackbirds show no food preference based on colour. 2. As people age, they do not respond to certain painkillers. 3. As concentration of inhibitor increases, enzyme activity decreases. 4. Increasing light intensity will not affect the rate of germination of cress seeds. A 1 and 4 only B 2 and 3 only C 2 and 4 only D 1, 2 and 3 only 5. Statins are drugs used to treat people with cardiovascular disease. One large study investigating the effectiveness of a statin drug randomly assigned patients to two groups: one group received the statin; the other group was given a placebo. One measure of the effectiveness of a treatment is the relative risk, which can be calculated using the formula: percentage of death in treatment group Relative risk percentage of death in control group  After a period of approximately six years, 91% of the patients given the statin and 87% of patients given the placebo survived. The relative risk for those given the statin is: A 0.69 B 0.96 C 1.05 D 1.44