An important issue is whether there are racial differences in hypertension among children. We define hypertension as being above the 95th percentile for either systolic blood pressure (SBP) or diastolic blood pressure (DBP) among children of the same age, height, and sex. Since some of the children were observed at multiple visits, a GEE model was run of hypertension on ethnic group. There were three ethnic groups considered: Caucasian, African American, and Hispanic. The results among boys are given in Table 13.54. TABLE 13.54 Relationship between hypertension and ethnic group among 27,009 boys in the Pediatric Task Force Data Variable Regression Coefficient SE Intercept -2.07 0.026 African American 0.049 0.041 Hispanic 0.328 0.059 What is the estimated OR for hypertension comparing Hispanic boys vs. Caucasian boys? (Call this OR1.) What is a 95% CI for this estimate?

As an admissions counselor, I am interested in understanding whether or not there is a difference in stress levels not only between different majors but also between different classes (Freshman v. Seniors). I gather the following data from students from three majors (Psychology, Chemistry, and Engineering), that are in their freshmen or senior years and ask them about their stress levels (scale of 1-10, with lower numbers meaning less stress). Using the data below, test whether there are effects of class, major, or an interaction between them at an alpha of 0.05.      Psychology Chemistry Engineering Freshmen 3, 4, 4, 2, 4 4, 5, 7, 8, 4 5, 7, 7, 8, 5 Senior 4, 5, 5, 3, 5 8, 5, 6, 7, 7 9, 9, 8, 7, 9 What is the critical F value for major?  ___________   What is the critical F value for class?  ___________   What is the critical F value for the interaction between major and class?  ___________

The accompanying table summarizes data from a survey of 3,594 parents with school-aged children. In this survey, parents were asked if they were completely satisfied with the education their oldest child receives. School Type Percentage of ParentsCompletely Satisfied Public 28% Private 62% Of the 3,594 parents surveyed, 608 were parents whose oldest child attended a private school. The parents participating in this survey were thought to be representative of U.S. parents of school-aged children. (a) Use the given information to determine the number of parents surveyed falling into each of the cells in the table below. (Round your answers to the nearest integer.)   CompletelySatisfied Not CompletelySatisfied Total Public School       Private School     608 Total     3,594 (b) Estimate the probability that a randomly selected parent of school-aged children is completely satisfied with his or her oldest child's education. (Round your answer to four decimal…

We often describe our emotional reaction to social rejection as “pain.” A clever study asked whether social rejection causes activity in areas of the brain that are known to be activated by physical pain. If it does, we really do experience social and physical pain in similar ways. Subjects were first included and then deliberately excluded from a social activity while changes in brain activity were measured. After each activity, the subjects filled out questionnaires that assessed how excluded they felt. Here are data for 13 subjects. The explanatory variable is “social distress” measured by each subject’s questionnaire score after exclusion relative to the score after inclusion. (So values greater than 1 show the degree of distress caused by exclusion.) The response variable is change in activity in a region of the brain that is activated by physical pain. create a scatterplot

A special education teacher wants to test the effects of online learning. A class of ten children are given traditional instruction for the first month of class. The amount of student-teacher interaction was assessed—i.e., the average number of seconds it took for the student to respond when called upon. Beginning the second month, laptop computers are provided to each student. The data below show the averages for each student. Did it take significantly longer for the students to respond when using the laptop. Test the research using a two-tailed test and α = .05.   Child no.​​.        Traditional​​​.        With lap-top 1​​​.                       2​​​​.                      3​ 2​​​.                       5​​​​.                      4​ 3​​​.                       7​​.                     ​​9​ 4​​​.                       2​​.                      ​​3​ 5​​​.                       3​​ .                     ​5​ 6​.                       ​​7​ ​​​.                      7​ 7​​​.…

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A social psychologist wants to know if people judge a person's attractiveness differently if they appear rich or poor. Two pictures were taken with the same model, one in expensive clothes standing next to a new sports car, and the other in old clothes standing next to an old hatchback car.  In an online survey, participants were randomly divided so that they saw one of the two pictures and were asked to rate the model's attractiveness on a scale of 1 to 10.  Which statistical test would be best to determine if there is a significant difference between groups?     one-sample t-test     dependent samples t-test     independent samples t-test     ANOVA

An article describes a study in which a new type of ointment was applied to forearms of volunteers to study the rates of absorption into the skin. Eight locations on the forearm were designated for ointment application. The new ointment was applied to six locations, and a control was applied to the other two. How many different choices were there for the six locations to apply the new ointment?

A psychologist has tested 400 people on areas that make up the Sleepiness and Associated Sensations Scale. Each individualis employed in one of four professions (Medical, Legal, Economics and Psychology). Each subject participates in astructured interview, during which the clinical psychologist makes ratings based on fatigue, lethargy, and energy.The data with the results can be found in the sheet labelled “Question 2”.a. Conduct the relevant test to determine if the individual items that make up the Sleepiness and Associated SensationsScale differs based on profession. b. Test the relevant assumptions associated with this test. c. JASP input and output files.

Health insurance benefits vary by the size of the company (the Henry J. Kaiser Family Foundation website, June 23, 2016). The sample data below show the number of companies providing health insurance for small, medium, and large companies. For the purposes of this study, small companies are companies that have fewer than 100 employees. Medium-sized companies have 100 to 999 employees, and large companies have 1000 or more employees. The questionnaire sent to  employees asked whether or not the employee had health insurance and then asked the enployee to indicate the size of the company.   Health Insurance   Size of Company Yes No Total     Small 39 11 50     Medium 62 13 75     Large 88 12 100               Conduct a test of independence to determine whether health insurance coverage is independent of the size of the company. What is the -value? Compute the value of the x2 test statistic (to 2 decimals). A newspaper article…