3. Is the conclusion correct? Why? (10 points) Using the following scale, _very effective (+2) _effective (+1) __neither effective nor ineffective (0) _ineffective (- 1) _very ineffective (-2). Drug A has an average from users of +1.2 and Drug B's average is +0.8. Therefore, Drug A is 50 percent more effective than Drug B. 4. A group of known smokers are sent literature on the harmful effects of smoking on a weekly basis for one year. At the end of the year, a poll is taken to see how many of the smokers stopped smoking during the year. The results are used to establish the effectiveness of this literature campaign in encouraging smokers to stop smoking. What are the potential hazards in drawing the above conclusion from this experiment? Identify at least two from the list: Mortality, Selection. Instrumentation, Testing, Maturation, and History, and explain your choices. (10 points) 5. What kind of statistical design would be appropriate for the following scenarios? (You don't need to elaborate.) (7 points) A researcher wants to compare the effects of four different print ads on consumers' brand attitudes. design