What are the explanatory and response variables? The researchers found that owls tend to have higher average income than the larks. Is this an observational study or a randomized experiment? What are the explanatory and response variables?

What are the explanatory and response variables? The researchers found that owls tend to have higher average income than the larks. Is this an observational study or a randomized experiment? What are the explanatory and response variables?

92.283 Introduction to Statistics Name:_____________________________________ Exam 2 October 22, 2012 Be sure to show all your work. Readability and Neatness are Important!!! A news article by Reuters reported: In a new study, Dr Matti Uhari and colleagues at the University of Oulu in Finland, randomly gave 857 healthy children in daycare centers xylitol in syrup, gum or lozenge form, or a placebo gum, syrup or lozenge in five doses per day for 3 months.

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92.283 Introduction to Statistics Name:_____________________________________ Exam 2 October 22, 2012 Be sure to show all your work. Readability and Neatness are Important!!! A news article by Reuters reported: In a new study, Dr Matti Uhari and colleagues at the University of Oulu in Finland, randomly gave 857 healthy children in daycare centers xylitol in syrup, gum or lozenge form, or a placebo gum, syrup or lozenge in five doses per day for 3 months. According to a report in the October issue of the Journal of Pediatrics, the incidence of ear infections were reduced by 40% in children given xylitol chewing gum, 30% in those given syrup and 20% in those given lozenges when compared to children give a placebo. Is this an observational study or a randomized experiment? If this is an experiment, what are the three criteria in this case? What are the explanatory and response variables? If it is an experiment, diagram the randomized comparative experiment. A news article on the Reuters Health website reported that: A study of over 1200 people over age 65 showed that the “owls” – those who tend to go to sleep after 11 p.m. and rise after 8 a.m. – tend to be as healthy and intelligent as “larks” – those who go to bed before 11 p.m. and rise before 8 a.m. – according to a report in the December 19/26 issue of the British Medical Journal . The researchers found that owls tend to have higher average income than the larks. Is this an observational study or a randomized experiment? What are the explanatory and response variables? The faculty senate at a large university wanted to know what proportion of the students thought a foreign language should be required for all students. A simple random sample of 500 students was selected. A survey form was sent to each of these 500 students by e-mail. What is the population of interest to the faculty senate? What is the sample? What is the variable under…

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