1) Decide if the following study is a observational study or an experiment of several types. A study compared the IQ from children whose mothers smoked to the IQ from children whose mothers didn't smoke. Select one: a. Simple observational study. b. Simple randomised experiment. c. Blocked randomised experiment. d. Case-control observational study. 2) To investigate whether women are more likely than men to prefer going to movies than goint to sport. a health scientist selected a large random sample of citizens. both men and women. She asks every person which of these activities the person preferred to do. What type of study design is used in this example? Select one: a. a blocked randomised experiment. b. a matched pairs experiment. c. an observational study. d. a simple experiment. 3) An investigation to promote an increase in the physical activity of teenagers is being designed. Two intervention programs are proposed: a \"physical activity intervention" for at school and at home and a \"nutrition intervention" to improve school lunches and offer ideas for healthy home-packed lunches. Each participating school was randomly assigned to one of the interventions, both interventions. or no intervention. The researchers observed physical activity and lunchtime consumption of fat. Rm. Ref 8-1 The response variable is Select one: a. the two intervention techniques. b. the physical activity and lunchtime consumption of fats. c. the \"nutritional intervention." d. the \"physical activity intervention.\" 4} A researcher studying the effect of price cuts on consumers' expectations makes up two different stories of the price of a hypothetical brand of laundry detergent for the past year. The two stories involve different scenarios of price changes. One is a steady price {scenario A) and the altemative history (scenario B) has regular sales that temporarily out the price. Students in a Business class view one or the other price history on a computer. A random half of the student group are shown only scenario A and the other half see only scenario B. To see the impact of this. the students are asked to state a price they would expect to pay. Mm: Rota2 The experimental units are Select one: a. the different types of scenario. b. the specic class of business students who participated. c. the price they expect to pay. d. all business students at the coilege