gestion 34 As we want our research participant sample to be as closely representative of all members of the population as possible, which of the following is most O a. Representativeness is the key. 10% of the sample frame is usually sufficient but not less than 30 to have a resonable chance of a normal distribut O b. when stratified data is available the sample size can be smaller O c. There are no guidelines about sample size O d. Sample size must be as large as possible because the more people that participate the cheaper it becomes per person