Blood serum is a component of blood important to the immune system. In a study, blood serum was collected from 20 men both before and immediately after exercise. Each of these serum samples were then exposed to a type of prostate cancer cell. Which assumption must be met for this test? Question 2Answer a. There's only one sample and two measurements are obtained per participant in the sample. b. All the data have to be >=10. c. The data are categorical. d. There are three or more variables. e. Linear relationship