Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment. Subject 0 weeks 2 weeks 4 weeks Mparticipant 1 28 45 69 47.33

Researchers were interested in assessing the effects of a new treatment on seasonal affective disorder. Mood was assessed in all participants at three time-points: (1) pre-treatment (0 weeks), (2) after 2 weeks of treatment, and (3) after 4 weeks of treatment. Subject 0 weeks 2 weeks 4 weeks Mparticipant 1 28 45 69 47.33

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

See similar textbooks

Similar questions

In a May 2011 study, Federal University Hospital in São Paulo, Brazil, 92 healthy pregnant women were separated into a control group and an experimental group. Those in the experimental group engaged in aerobic water exercise throughout their pregnancy whereas those women in the control group did not. After giving birth the neonatal outcome of the children of all women in the study was recorded where a negative neonatal outcome was defined as a hospital stay of more than four days. A set of similar results is shown in the table Group Positive Neonatal Outcome Negative Neonatal Outcome Water Exercise 22 19 Control Group 21 30 At a 5% level of significance, test the claim that the neonatal outcome was unrelated to the group in which they were assigned. (Water exercise or control group.) Calculate the test statistic as X squared.
In a May 2011 study, Federal University Hospital in São Paulo, Brazil, 71 healthy pregnant women were separated into a control group and an experimental group. Those in the experimental group engaged in aerobic water exercise throughout their pregnancy whereas those women in the control group did not. After giving birth the neonatal outcome of the children of all women in the study was recorded where a negative neonatal outcome was defined as a hospital stay of more than four days. A set of similar results is shown in the table Group Positive Neonatal Outcome Negative Neonatal Outcome Water Exercise 15 15 Control Group 12 18 A hypothesis test was carried out, yielding a p-value of 0.396. What is the correct interpretation? 1.Do not reject H0 since the p-value is greater than 0.05. 2. Reject H0 since the p-value is greater than 0.05. 3. Do not reject H0 since the p-value is less than 0.05. 4. Reject H0 since the p-value is less than 0.05. AND Based…
In a May 2011 study, Federal University Hospital in São Paulo, Brazil, 71 healthy pregnant women were separated into a control group and an experimental group. Those in the experimental group engaged in aerobic water exercise throughout their pregnancy whereas those women in the control group did not. After giving birth the neonatal outcome of the children of all women in the study was recorded where a negative neonatal outcome was defined as a hospital stay of more than four days. A set of similar results is shown in the table Group Positive Neonatal Outcome Negative Neonatal Outcome Water Exercise 19 17 Control Group 11 19 At a 5% level of significance, test the claim that the neonatal outcome was unrelated to the group in which they were assigned (Water exercise or control group). State the null and alternative hypothesis and identify the claim from the options below 1. H0: Neonatal outcome and group assignment are independent. HA: Neonatal…
Researchers are interested in the effectiveness of a new anti-retroviral medication at increasing 5 year survival for HIV infected persons with Hepatitis C. In order to test the efficacy of the new study drug, the researchers randomly assigned participants to receive either the new medication or a placebo. The following table summarizes preliminary results of the trial. Deceased Non-Deceased Total New Vaccine 55 84 139 Placebo 61 67 128 Total 116 151 267 A) Calculate the relative risk for mortality among those treated with the new vaccine versus the placebo. B) Interpret the relative risk measurement.
Baum and Gatchel (1981, Cognitive determinants of reaction to uncontrollable events: Development of reactance andlearned helplessness. Journal of Personality and Social Psychology, 40, 1078-1089) found that students living in longcorridordorms (housing 30 to 40 residents per corridor) had greater feelings of helplessness than those living in shortcorridordorms (housing less than 20 residents per corridor). A resident director at GSU wished to test this finding tolearn whether corridor length impacted students' sense of alienation. She randomly assigned 20 students to live in aresidence hall, with 10 students in long and 10 students in short corridors for the year. At the end of the year, each2/16/21 3student completed a measure of alienation. Below are her data—does corridor length affect feelings of alienation? Use an independent samples t-test to analyze these data. Corridor LengthAlienation Scores From 20 Different StudentsLong =19,15,14,15,15,9,16,15,17,13Short =11,…
In a study of hypnotic suggestion, 16 male volunteers were randomly allocated to a treatment groupand a control group. Each subject participated in a two-phase experimental session. In the first phase, respiration was measured while the subject was awake and at rest. In the second phase, the subject was told to imagine that he was performing muscular work, and respiration was measured again. For subjects in the treatment group, hypnosis was induced between the first and second phases; thus, the suggestion to imagine muscular work was “hypnotic suggestion” for treatment subjects and “waking suggestion” for control subjects. The table below shows the measurements of total ventilation (liters of air per minute per square meter of body area) for all 16 subjects. (a) For those being hypnotized (treatment group), test the hypotheses H0: μrest = μwork versus Ha:μrest 6= μwork, where μrest and μwork are respectively the mean total ventilation when they are atrest and when they are performing…
An experiment to determine if a migraine medication decreases a person's average number of monthly migraines is performed on 400 people who report they have several migraines a month. Researchers randomly assigned 200 people to the treatment group and 200 people to the control group. After the study, the researchers determined that 48 of the subjects in the treatment group and 28 of the subjects in the control group average fewer migraines per month. The data from the two groups are resampled 150 times, and the table shows the distribution of the differences of the proportions for the reconfigured treatment and control groups.
Three experiments investigating the relation between need for cognitive closure and persuasion were reported in “Motivated Resistance and Openness to Persuasion in the Presence or Absence of Prior Information,” by A. W. Kruglanski (Journal of Personality and Social Psychology, Vol. 65, No. 5, pp. 861–874). Part of the study involved administering a “need for closure scale” to a group of students enrolled in an introductory psychology course. The “need for closure scale” has scores ranging from 101 to 201. For the 73 students in the highest quartile of the distribution, the mean score was 178.70 . Assume a population standard deviation of 7.81. These students were all classified as high on their need for closure. Assume that the 73 students represent a random sample of all students who are classified as high on their need for closure. Find a 95% confidence interval for the population mean score on the “need for closure scale” for all students with a high need for closure
A hospital conducted a study of the waiting time in its emergency room. The hospital has a main campus and three satellite locations. Management had a business objective of reducing waiting time for emergency room cases that did not require immediate attention. To study this, a random sample of 15 emergency room cases that did not require immediate attention at each location was selected on a particular day, and the waiting times (measured from check into when the patient was called into the clinic area) were collected and stored in the table. At the 0.05 level of significance, is there evidence of a difference in the mean waiting times in the four locations? Main Satellite 1 Satellite 2 Satellite 3 120.08 30.75 75.86 54.05 81.90 61.83 37.88 38.82 78.79 26.40 68.73 36.85 63.83 53.84 51.08 32.83 79.77 72.30 50.21 52.94 47.94 53.09 58.47 34.13 79.88 27.67 86.29 69.37 48.63 52.46 62.90 78.52 55.43 10.64 44.84 55.95 64.06 53.50 64.17 49.61 64.99 37.28 50.68…
A study investigated the joint effects of sleep quality and sleep duration on the development of coronary heart disease (CHD). A total of 60,586 individuals aged 40 and older with no current or prior history of CHD were enrolled into the study. A self-administered questionnaire was used to collect information on sleep quality and duration at the start of the study, and 43,910 participants reported getting ³6 hours of sleep per day. Participants were followed for approximately 12 years, for a total of 152,000 person-years among those getting <6 hours sleep/day and 527,000 person-years among those getting ³6 hours sleep/day. Out of 2,740 participants who developed CHD throughout follow-up, 721 participants reported getting <6 hours of sleep per day at baseline. Question 10: What is the incidence rate of coronary heart disease among all participants in the study?
A survey across generations of workers gathered data on engagement at work. The results for a sample of 1,000 workers are in the accompanying contingency table. At the 0.10level of significance, is there evidence of a significant relationship between generation and level of engagement in the workplace? Contingency Table GENERATION LEVEL OF ENGAGEMENT Millennials Gen Xers Baby Boomers Traditionalists Total Engaged 96 110 94 12 312 Not Engaged 199 176 130 10 515 Actively Disengaged 53 59 54 7 173 Total Question content area bottom Part 1 What are the null and alternative hypotheses to test? H0: No relationship exists between generation and level of engagement. H1: A relationship exists between generation and level of engagement. Part 2…
A suburban hotel derives its revenue from its hotel and restaurant operations. Theowners are interested in the relationship between the number of rooms occupied on anightly basis and the revenue per day in the restaurant. Below is a sample of 25 days(Monday through Thursday) from last year showing the restaurant income and numberof rooms occupied.