4. Which kind of study is generally more effective at blocking confounders?
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- What is meant by the sample space of an experiment?The following results are from an independent-measures, two-factor study with n = 10 participants in each treatment condition.9) Which of the followirig describes a study in which neither the participants nor the experimenters know which participants are in the control group?A) Single-blind experiment B) Observational study C) Double-blind experiment D) Case_control study E) None of the above
- Do well-rounded people get fewer colds? A study on the Chronicle of Higher Education was conducted by scientist at Carnegie Mellon University, the University of Pittsburgh and the University of Virginia. They found that people who have only a few social outlets get more colds than those who are involved in a variety of social activities. Suppose that of the 276 healthy men and women tested, n1=96 had only a few social outlets and n2=105 were busy with six or more activities. When these people were exposed to a cold virus, the following results were observed: Construct a 99% confidence interval for the difference in the two population proportions.Determine whether each of the following studies described is observational or an experiment. If the study is an experiment, identify the control and treatment groups, and disucss whether single-or double-blinding is necessary. If the study is observational, state whether it is a retrospective study, and if so, identify the cases and controls. In a study of the effects of magnets on back pain, some subjects were treated with magnets while others were given non-magnetic devices with similar appareance. (The magnets did not appear to be effective in treating back pain).Based on a survey of 12,344 U.S. college students and 6,729 Canadian college students, Kuo, Adlaf, Lee, Gliksman, Demers, and Wechsler (2002) report that alcohol use is more common among Canadian than U.S. students, but heavy drinking (five or more drinks in a row for males, four or more for females) is significantly higher among U.S. students than Canadian students. Is this an example of a survey research design?
- is the study of Kao Adlaf Lee Gliksman Demers and Wechsler 2002 an example of an experiment studyDetermine whether each of the following studies described is observational or an experiment. If the study is an experiment, identify the control and treatment groups, and disucss whether single-or double-blinding is necessary. If the study is observational, state whether it is a retrospective study, and if so, identify the cases and controls. A National Cancer Institute study of 716 melanoma patients and 1014 cancer-free patients matched by age, sex, and race found that those having a single large mole had twice the risk of melanoma. Having 10 or more moles was associated wiht a 12 times greater risk of melanoma.According to the following data: CFR Covid Case Fatality Rate 2020 CFR Covid Case Fatality Rate 2022 World 2.32 1.24 China 5.32 2.75 Italy 3.49 1.04 USA 1.79 1.23 New York 3.74 1.32 Louisiana 2.20 1.39 What might be the likely changes in test sensitivity vs. specificity, population mobility and behavior (quarantine), and population demographics when comparing CFR Covid cases from 2020 vs. 2022?
- A researcher plans to conduct a research study comparing two treatment conditions with a total of 20 scores in each treatment. Which of the following designs would require only 20 participants? a. independent-samples design b. matched-subjects design c. between-subjects design d. within-subjects designA Doctor is interested in the proportion of Lyon county residents who were infected with covid-19 virus. There were 425 covid-19 cases reported among 25474 residents in Lyon county. a. What is a statistics in this experiment? b. What variables should pollster collect in this experiment?Determine whether the following statement makes sense (or is clearly true) or do not make sense ( or is clearly false) a study on the effect of gender on movie attendence was baised because the sample consisted of 800 males and 200 females choose the correct answer and explanation from thenchoices below.