A medical researcher designs a study that will investigate the effects of a new drug on lowering patient's cholesterol level. The researcher randomly
selects participants for two groups. One group is given the new drug and the
other group is given a placebo. Any person, within driving distance of the
hospital, is allowed to participate and will be given a monetary compensation.
Each sample consists of 5 patients. Select all weaknesses in the design.

Finally, the arena decides to offer advertising space on the jerseys of the arena’s own amateur volley ball team. the arena wants the probability of being shortlisted to be 0.14. what is this as a percentage and a fraction? what is the probability of not being shortlisted? give your answer as a decimal. those shortlisted are entered into a final game of chance. there are six balls in a bag (2 blue balls, 2 green balls and 2 golden balls). to win, a company needs to take out two golden balls. the first ball is not replaced. what is the probability of any company winning advertising space on their volley ball team jerseys?