17. Many parents allow their underage children to drinkalcohol in limited situations when an adult is presentto supervise. The idea is that teens will learn responsi-ble drinking habits if they first experience alcohol in acontrolled environment. Other parents take a strict no-drinking approach with the idea that they are sendinga clear message about what is right and what is wrong.Recent research, however, suggests that the more per-missive approach may actually result in more negativeconsequences (McMorris et al., 2011). The research-ers surveyed a sample of 150 students each year fromages 14 to 17. The students were asked about theiralcohol use and about alcohol-related problems suchas binge drinking, fights, and blackouts. The followingtable shows data similar to the results from the study.Not Allowed to DrinkAllowed to DrinkExperience with Alcohol-Related ProblemsNo7189160Yes9314080120n = 200 17. Many parents allow their underage children to drinkalcohol in limited situations when an adult is presentto supervise. The idea is that teens will learn responsi-ble drinking habits if they first experience alcohol in acontrolled environment. Other parents take a strict no-drinking approach with the idea that they are sendinga clear message about what is right and what is wrong.Recent research, however, suggests that the more per-missive approach may actually result in more negativeconsequences (McMorris et al., 2011). The research-ers surveyed a sample of 150 students each year fromages 14 to 17. The students were asked about theiralcohol use and about alcohol-related problems suchas binge drinking, fights, and blackouts. The followingtable shows data similar to the results from the study.Not Allowed to DrinkAllowed to DrinkExperience with Alcohol-Related ProblemsNo7189160Yes9314080120n = 200

Part (a) : To test the relationship we will use the chi-square test of independence. The null and…

Answered: 17. Many parents allow their underage…

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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2. Motor vehicle collision is one of major causes of death in North America. Although the causes of motor vehicle collisions are complicated, many believe that cellular telephones while driving may contribute to collisions by distracting drivers. In order to test the hypothesis that using a cellular telephone while driving increases the risk of a motor vehicle collision. An observational epidemiological study was proposed to assess the association. If you are the principal investigator of the project, a. What type of observational study would be ideal to study this hypothesis? b. Why do you recommend this study design?
5. A dummy medication (such as a salt tablet) will often help a patient who trusts the doctor who administers the medicine. This is called: O the placebo effect. O confounding variables. O double-blindness. O confidentiality.
2. A researcher wants to determine which of three advertisements is most likely to encourage teens not to smoke. To assess the impact of each advertisement, she asks a sample of teenagers to view each ad and to rate the ad's effectiveness on a scale of 1 (not at all effective) to 7 (very effective). One ad used words only (no-cues condition), a second ad used a generic abstract picture (generic-cues condition), and a third showed a picture of a teen smoking and coughing (smoking-related cues condition). Fully test the question (5 steps) and determine the effect size. Participant ABCDEFG No Cues 2 3 1 4 4 5 2 T = 21 SS = 12 Generic Cues 5 5 4 5 3 4 2 T1 = 28 SS=8 Smoking- Related Cue 5 6 5 7 6 7 6 T2 = 42 SS = 4 P G = 91 ΣΧ2 = 451
What is the conclusion of the independence test? A. Reject H0. The data do not provide sufficient evidence of an association. B. Do not reject H0. The data provide sufficient evidence of an association. C. Do not reject H0. The data do not provide sufficient evidence of an association. D. Reject H0. The data provide sufficient evidence of an association
Top management of a large multinational corporation wants to create a culture of innovativeness and change. A consultant hired to assess the company's organizational culture finds that only 15% of employees are open to new ideas and approaches toward their work. One of his recommendations for the company is to conduct seminars for employees in order to disseminate and reinforce the new corporate philosophy. This is done for a six month trial period after which its value in changing employee attitudes will be assessed. Write the null and alternative hypotheses. 2. Based on data collected after the trial period, the company constructed a 95% confidence interval for the proportion of all employees open to new ideas and approaches toward their work. The resulting interval is 18% to 22%. What conclusion should the company reach about the seminars?
Do ethnic group and gender influence the type of care that a heart patient receives? The following pas- sage is from the article “Heart Care Reflects Race and Sex, Not Symptoms” (USA Today, February 25, 1999, reprinted with permission):Previous research suggested blacks and women were less likely than whites and men to get cardiac cathe- terization or coronary bypass surgery for chest pain or a heart attack. Scientists blamed differences in illness severity, insurance coverage, patient preference, and health care access. The researchers eliminated those differences by videotaping actors—two black men, two black women, two white men, and two white women—describing chest pain from identical scripts. They wore identical gowns, used identical gestures, and were taped from the same position. Researchers asked 720 primary care doctors at meetings of the American College of Physicians or the American Academy of Family Physicians to watch a tape and recommend care. The doctors thought the…
1
2. In a study of jury behavior, two samples of participants were provided details about a trial in which the defendant was obviously guilty. Although group 2 received the san details as group 1, the second group was also told that some evidence had been withheld from the jury by the judge. Later, the participants were asked to recommend a jail sentence. The length of term suggested by each participant is presented here. Is there a significant difference between the two groups in their responses? For Group 1: M = 3, SS = 16, n= 8 For Group 2: M = 6, SS = 24, n = 10 %3D a. Formulate the hypotheses. b. Determine the critical value(s). c. Calculate the test statistic.
In this same passage, what is the explanatory variable and is it categorical or quantitative?
Under what circumstances is it advisable to switch to a between-subjects design instead of using a within-subjects design?
2. Many people take ginkgo supplements advertised to improve memory. Are these over-the- counter supplements effective? In a study, elderly adults were assigned to the treatment group or control group. The 104 participants who were assigned to the treatment group took 40 mg of ginkgo 3 times a day for 6 weeks. The 115 participants assigned to the control group took a placebo pill 3 times a day for 6 weeks. At the end of 6 weeks, the Wechsler Memory Scale was administered. Higher scores indicate better memory function. Summary values are given in the following table: a) Based on these results, is there evidence that taking 40mg of ginkgo 3 times a day is effective in increasing mean performance on the Wechsler Memory Scale?b) Write a brief report on your findings
There is some evidence that high school students justify cheating in class on the basis of poor teacher skills or low levels of teacher caring (Murdock, Miller, & Kohlhardt, 2004). Students appear to rationalize their cheating behavior based on perceptions of how their teachers view cheating. Poor teachers are thought not to know or care whether students cheat, so cheating in their classes is okay. Good teachers, on the other hand, do care and are alert to cheating, so students tend not to cheat in their classes. The scores below represent judgments of the acceptability of cheating for the students in each sample (a higher number means it is more acceptable to cheat). Is there a difference in the student ratings of how acceptable it is to cheat based on teacher type? Use an ANOVA with a = .05 to determine whether there are any significant differences among the three types of teachers in the acceptability of cheating based on student ratings. Fill in missing values in the data table and…

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