answer 3 odds ratio and make an interpretation Show complete solutions and round off your answers up to 4 decimal places.A prospective study on the relationship between aspirin use and heart attacks by thePhysicians' Health Study Research Group at Harvard Medical School is presented below.The Physicians' Health Study was a 5-year randomized study of whether regular aspirinintake reduces risk of myocardial infarction or heart attack. Every other day, physiciansparticipating in the study took either one aspirin tablet or a placebo. The study was blindthose in the study did not know whether they were taking aspirin or a placebo.Of the 11,034 physicians taking a placebo, 189 suffered heart attacks over the course ofthe study, whereas of the 11,037 taking aspirin, 104 had heart attacks. Can we say that theintake of aspirin appears to diminish the risk of myocardial infarction?Myocardial InfarctionNoGroupTotalYesPlacebo 189Aspirin 104Total 293108451103410933110372177822071Let patients taking placebo be the first group and those taking aspirin in the secondgroup. Calculate the following and make an interpretation:1. risk difference2. relative risk3. odds ratio

Given Information: Consider the given data: Hear Attack No Heart attack Total Placebo 189…

Answered: Show complete solutions and round off…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.90, a random sample of 100 doctors results in 83 who indicate that they recommend aspirin. The value of the test statistic in this problem is approximately equal to ______
Adrian claims that his new training methods have improved his batting average. Before starting his new regimen, he was batting 0.220 in a random sample of 50 bats. For a random sample of 24 at-bats since changing his training technique, his batting average is 0.375. Determine if there is sufficient evidence to say that his batting average has improved at the 0.10 (10%) level of significance.
Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous six months, in a sample of 115 new car buyers, 46 have traded in their old car. To determine (at the 10% level of significance) whether the proportion of new car buyers that trade in their old car has this is statistically significantly decreased, what can you conclude concerning the null hypothesis? A) reject the null hypothesis Or B) fail to reject the null hypothesis
A double-blind, randomized comparative experiment compared the effect of the drug lorcaserin and a placebo on weight loss in overweight adults. All subjects also underwent diet and exercise counseling. The study reported that, after one year, patients in the lorcaserin group had an average weight loss of 5.8 kilograms (kg), while those on the placebo had an average weight loss of 2.2 kg (P < 0.001). Explain to someone who knows no statistics why these results mean that there is good reason to think that lorcaserin works. Include an explanation of what P < 0.001 means.
Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous six months, in a sample of 115 new car buyers, 46 have traded in their old car. To determine whether the proportion of new car buyers that trade in their old car has this is sickly significantly decreased, what is the null and alternative hypothesis?
A researcher is interested in the effect of the pandemic on social media use among college students. The researcher hypothesizes that college students spend more time on social media than they did before the pandemic. To test his hypothesis, he randomly selected 50 college students and asked how many hours do they spend on social media per day before and after the pandemic. What is the research question? Do college students spend more time on social media that they did before the pandemic? What is/are the variable(s)? What graphs can be used to display the variable(s) visually? What statistical test can be used to answer the research question?
A researcher is interested in the effect of the pandemic on social media use among college students. The researcher hypothesizes that college students spend more time on social media than they did before the pandemic. To test his hypothesis, he randomly selected 50 college students and asked how many hours do they spend on social media per day before and after the pandemic. What is the research question? Do college students spend more time on social media that they did before the pandemic? What is/are the variable(s)? What graphs can be used to display the variable(s) visually? Variables- social media & college students. The graph that could be used is What statistical test can be used to answer the research question?
A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim against the alternative that the actual proportion of doctors who recommend aspirin is less than 0.90, a random sample of 100 doctors results in 83 who indicate that they recommend aspirin. The value of the test statistic is
It is believed that a sweetener called xylitol helps prevent ear infections. In a randomized experiment, 165 children took a placebo and 68 of them got ear infections. Another sample of 159 children took xylitol and 46 of them got ear infections. The scientists believe that the proportion of ear infections in the placebo group will be greater than the xylitol group. Test this hypothesis at α = 0.025.
The cost of attending your college has once again gone up. Although you have been told that education is investment in human capital, which carries a return of roughly 10% a year, you (and your parents) are not pleased. One of the administrators at your university/college does not make the situation better by telling you that you pay more because the reputation of your institution is better than that of others. To investigate this hypothesis, you collect data randomly for 100 national universities and liberal arts colleges from the 2000-2001 U.S. News and World Report annual rankings.Next you perform the following regression cost^= = 7,311.17 + 3,985.20 × Reputation – 0.20 × Size (2,058.63) (664.58) (0.13) + 8,406.79 × Dpriv – 416.38 × Dlibart – 2,376.51 × Dreligion(2,154.85) (1,121.92) (1,007.86) R2=0.72, SER=3,773.35 where Cost is Tuition, Fees, Room and Board in dollars, Reputation is the index used in U.S. News and World…
The cost of attending your college has once again gone up. Although you have been told that education is investment in human capital, which carries a return of roughly 10% a year, you (and your parents) are not pleased. One of the administrators at your university/college does not make the situation better by telling you that you pay more because the reputation of your institution is better than that of others. To investigate this hypothesis, you collect data randomly for 100 national universities and liberal arts colleges from the 2000-2001 U.S. News and World Report annual rankings.Next you perform the following regression cost^= = 7,311.17 + 3,985.20 × Reputation – 0.20 × Size (2,058.63) (664.58) (0.13) + 8,406.79 × Dpriv – 416.38 × Dlibart – 2,376.51 × Dreligion(2,154.85) (1,121.92) (1,007.86) R2=0.72, SER=3,773.35 where Cost is Tuition, Fees, Room and Board in dollars, Reputation is the index used in U.S. News and World…
Historically, the proportion of people who trade in their old car to a car dealer when purchasing a new car is 48%. Over the previous 6 months, in a sample of 115 new-car buyers, 46 have traded in their old car. The p-value for the test of whether the proportion of people who trade in their old cars to a car dealer has decreased is 0.0427. If we were to test this hypothesis at the 5% level of signficance, what can you conclude concerning the null hypothesis?

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