In an experimental study, what makes one variable the predictor (i.e., independent) and the other one predicted (i.e., dependent)?
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In an experimental study, what makes one variable the predictor (i.e., independent) and the other one predicted (i.e., dependent)?
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- The medical researcher is comparing two treatments for lowering cholesterol: diet and meds. The researcher wants to see if the patients who receive the recommendation to change their diet have more success lowering cholesterol compared to a prescription of meds. A random sample of some patients who received the recommendation to change their diet and others who were prescribed meds was taken. The results of how many did or did not lower their cholesterol are shown below: Data on Diet vs. Meds for Weight Loss Diet Meds Yes 424 502 No 255 320 What can be concluded at the = 0.05 level of significance? For this study, we should use Select an answer z-test for a population proportion t-test for the difference between two dependent population means t-test for a population mean z-test for the difference between two population proportions t-test for the difference between two independent population means The null and alternative hypotheses would be: Select an…D. In panel data, there are two key models, REM and FEM. Explain what the two models are, stating their key assumptions, differences, advantages and disadvantages.A sociologist is interested in determining if those shopping at the mall tend to spend more money if they are with friends versus if they are shopping alone. She interviews 8 shoppers who regularly shop at the mall, both alone and with friends, and inquires about the following two variables: X1-amount spent when they last shopped alone and X2 amount spent when they last shopped with their friends. Below is the data she collected: Shopper X1 X2 1 35 72 10 15 3 80 100 55 90 35 55 23 58 25 25 138 210 (a) What type of test do we need to conduct and what assumptions are necessary? (b) Assuming our assumptions in (a) are valid, by hand, conduct an appropriate test of significance at 2% level of significance to determine if shoppers spend more money when they are with friends than when they are alone using a rejection region approach.
- Consider that the results of a research study conclude that the “effect of social media use on anxiety depends on gender.” Which statement below is correct based on this conclusion? a. The research study uncovered a main effect of social media use, but no main effect of gender or interaction between gender and social media use. b. The research study uncovered a main effect of gender and interaction of gender and social media use, but not main effect of social media use. c. The research study uncovered an interaction between social media use and gender, but no main effects. d. The research study uncovered no main effects of gender or social media use, as well as no interaction between gender and social media use.If a researcher found a significant interaction between Factor A and Factor B, what does this mean (in general)? O Both Factor A & Factor B have independent effects. O The effect of Factor A on the dependent variable depends on the level of Factor B. O Only Factor A is significant. none of the above.Is it possible to have several dependent variables in a model? Are several variables possible in a decision-making problem? Which model—descriptive, predictive, or prescriptive—of a particular choice issue would you be most likely to employ if it were offered to you? Why? Give an example of a well-known corporate, political, or military leader who made a choice that either had a positive or negative impact. What distinguishes a computer model from a spreadsheet model?
- A group of educators want to determine how effective tutoring is in raising students' grades in a math class, so they arrange free tutoring for those who want it. Then they compare final exam grades for the group that took advantage of the tutoring and the group that did not. Suppose the group participating in the tutoring tended to receive higher grades on the exam. Does that show that the tutoring worked? If not, explain why not and suggest a confounding variable. Question content area bottom Part 1 Choose the correct answer below. A. Because this was an observational study, it only shows an association; it does not show that the tutoring worked. It could be that an insufficient number of students were studied to show that the tutoring worked. B. The study shows that the tutoring worked. C. Because this was an observational study, it only shows an association; it does not show that the tutoring worked. It could be that more motivated…Based on a graph below which of the following statement describes the best types of associations between Factors A, C, and D and the Disease: (choose one best answer) Factor Factor C Disease Factor A O Factor A is sufficient but not necessary, while Factors C and D and neither sufficient not necessary. O Factors A, C and D are neither sufficient nor necessary. O Factor A is necessary but not sufficient, while Factors C and D are necessary but not sufficient. O Factor A is sufficient but not necessary, while Factors C and D are neither sufficient not necessary.I am determining how effective a Drug is at reducing inflammation in individuals infected with a virus. the serum levels of antibody are measured as a measure of inflammation (less antibodies means less inflammation which decreases virus mortality) in 30 people given placebo, 30 people given 1 unit of the drug, and 30 people given 2 units of the drug. I would like to determine what levels of the drug are effective, and if there are sex-specific effects. What are the dependent and independent variables in this experiment? age _________ sex __________ antibody level _____________ treatment ___________
- Students at multiple grade schools were asked what their personal goal (get good grades, be popular, be good at sports) was and how important being good at sports were to them ("One" means very important to "Four" which means least important). The data is in table #11.1.10 ("Popular kids datafile," 2013). Do the data provide enough evidence to show that goal attainment and importance of sports are independent? Test at the 5% level. One Two Three Four Grades 83 81 55 28 Popular 32 49 43 17 Sports 50 24 14 2 State the null and alternative hypotheses and the level of significance. Find the test statistic and p-value. Label each. . Conclusion and InterpretationWhat is the Independent variable and the dependent variable of this problem? A neuropsychologist is studying brainlateralization—the degree to which thecontrol of various cognitive functions islocalized more in one cerebral hemispherethan the other. This researcher is awarethat for men, being right-handed seemsto be associated with a greater degree oflateralization than does being left-handedbut that this relationship may not applyto women, who seem to be less lateralizedin general. Various tasks are used in combination to derive a lateralization scorefor each subject as shown in the followingtable.5