There 7 questions, please write 1,2,3,7 with the process, others are multiple choices, Thank u so much: 6. An Atlanta school district wants to compare the effectiveness of a standard AP Statistics curriculum and a new hands-on" AP Statistics curriculum. Two experienced teachers, Mrs. Davis and Mr. Cohen, each teach one class with the standard curriculum and one with the new approach. Students are assigned at random to these four classes. At the end of the year, all students take the AP Statistics exam. This experiment...A. has one factor: the type of AP Statistics curriculum a student is assigned to.B. has two factors: the type of AP Statistics curriculum and the teacher a student is assigned to.C. has two factors: the standard curriculum and one with the hands-on approach.D. has three factors: the type of AP Statistics curriculum, the teacher, and the class a student is assigned to. has three factors: the standard curriculum, the hands-on approach, and the teacher a student is assigned to.7. Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy and completeness of your results and explanations. A medical researcher wishes to design an experiment to determine how calcium citrate affects bone density. She has 40 volunteers (20 healthy women over sixty and 20 healthy men over sixty). She will first measure the current bone density of each subject. She has two treatments, a pill containing 1000 mg of calcium citrate, and a placebo pill which looks and tastes just like the calcium citrate pill. At the end of the study she will re- measure each subjects bone density and find the improvement made.(a) What type of design was used in this study and why? Explain your answer. (6 points)(b) If the results were statistically signifcant, can the results of this study be generalized to a larger population? Can cause-and-effect be inferred? Explain. (6 points)(c) Explain why it would have been advantageous to use more volunteers, say 400, in this study, rather than 40. (6 points)(d) Name two variables that were controlled in this experiment and why was it beneficial to control these variables? (6 points)
Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy and completeness of your results and explanations. Which of the following is the best description of a simple random sample of size n from a population of size N? In a 1995 Corporation for Public Broadcasting poll of TV viewership, one question was, "A recent study by a psychology professor at a leading university concluded that the amount of violence children see on television has an effect on their likelihood of being aggressive and committing crimes. From what you have seen or heard about this subject, do you agree strongly with that conclusion, agree somewhat, or disagree strongly?" Is A sampling method in which individuals are selected in a completely haphazard fashion. this question appropriate, or is it flawed in some way? Comment briefly. A sampling method in which every group of individuals of size n is equally likely to be selected. Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy and A sampling method in which every individual is equally likely to be selected. completeness of your results and explanations. Here's a quick and easy way to randomize. You have 100 subjects, 50 women and 50 men. Toss a coin. If it's heads, assign all the men to the A sampling method in which each individual has a probability of n/N of being selected. treatment and all the women to the control group. If the coin comes up tails, assign all the women to treatment and all the men to control. This gives every individual subject a 50-50 chance of being assigned to treatment or control. Is this a reasonable way to randomly assign subjects to treatment A sampling method that involves the use of a random digits table. groups? Explain your reasoning. Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy and 5 Researchers wish to determine if a new experimental medication will reduce the symptoms of allergy sufferers without the side effect of drowsines completeness of your results and explanations. o investigate this question, the researchers randomly assigned 100 adult volunteers who suffer from allergies to two groups. They gave the new medication to the subjects in one group and an existing medication to the subjects in the other group. Forty-four percent of those in the treatment Mrs. Elliott, a teacher at Durham School of the Arts, studies the effect of "personal narratives" on people's behavior. For example, if the "story" you group and 28% of those in the control group reported a significant reduction in their allergy symptoms without any drowsiness. The experimental have about your academic ability is positive, you do better in school than if your "story" is negative. Something as simple as hearing older students units are the describe overcoming challenges similar to yours can help you change your story and improve your performance. (a) Suppose you have 40 college freshman who have volunteered to be part of a study. Design a completely randomized experiment that tests the 100 adult volunteers hypothesis that hearing older students talk about overcoming challenges improves academic performance. Be sure your design addresses how all the volunteers who reported a significant reduction in their allergy symptoms without any drowsiness. randomization will be incorporated. (7 points) the researchers. (b) Suppose you have reason to believe that students with a history of strong academic performance respond differently than those with a history of modest performance. Describe how you would change the experimental design to address this difference. (7 points) all the volunteers who did not report a significant reduction in their allergy symptoms without any drowsiness. pills containing the new experimental medication
