Essentials Of Statistics For The Behavioral Sciences
9th Edition
ISBN: 9781337273312
Author: GRAVETTER, Frederick J., Wallnau, Larry B., Forzano, Lori-ann B.
Publisher: Cengage Learning,
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Chapter 12.5, Problem 2LC
To determine
The treatments which are significantly different.
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Carter et al investigated the effect of age at onset of bipolar disorder on the course of the illness. One of the variables studied was the subjects' family history. The table below shows the frequency of a family history of mood disorders in the two groups of interest: early age at onset (18years or younger) and later age at onset (later than 18 years old). Can we conclude on the basis of these data that subjects 18 or younger differ from subjects older than 18 with respect to family histories ofmood disorders? Ref: J Psychiatric Research 37(2003), 297-303.
Researchers at a local public health office are interested in the difference in prevalence of sickle cell anemia by ethnicity in a population under its jurisdiction. Suppose the following table represents prevalence of sickle cell anemia reported based on a thorough survey.
Ethnicity Prevalence of Sickle Cell
African-American =242/1049
Other =165/1864
Calculate the risk difference between the groups.
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?
Chapter 12 Solutions
Essentials Of Statistics For The Behavioral Sciences
Ch. 12.1 - How many levels are there in a single-factor...Ch. 12.1 - When is the distinction between the testwise alpha...Ch. 12.1 - Which of the following accurately describes the...Ch. 12.2 - For an analysis of variance, the differences...Ch. 12.2 - What is suggested by a large value for the F-ratio...Ch. 12.3 - An analysis of variances produces dfbetween...Ch. 12.3 - An analysis of variance is used to evaluate the...Ch. 12.3 - A research study compares three treatments with n...Ch. 12.4 - A researcher uses analysis of variance to test for...Ch. 12.4 - The following table shows the results of an...
Ch. 12.4 - A research report concludes that there are...Ch. 12.5 - Under what circumstances are post hoc tests...Ch. 12.5 - Prob. 2LCCh. 12.6 - Which combination of factors is most likely to...Ch. 12.6 - If an analysis of variance is used for the...Ch. 12.6 - A researcher uses an ANOVA to evaluate the mean...Ch. 12 - Why should you use ANOVA instead of several t...Ch. 12 - What value is expected for the F-ratio, on...Ch. 12 - Describe the similarities between an F-ratio and a...Ch. 12 - Calculate SSwith, SSbetween, SSwithin for the...Ch. 12 - A researcher uses an ANOVA to compare three...Ch. 12 - A researcher reports an F-ratio with dfbetween2...Ch. 12 - A researcher reports an F -ratio with df = 3.24...Ch. 12 - The following values are from an...Ch. 12 - A researcher conducts an experiment comparing four...Ch. 12 - The following summary table presents the results...Ch. 12 - A developmental psychologist is examining the...Ch. 12 - The following data were obtained from an...Ch. 12 - The following data were obtained from an...Ch. 12 - A research study comparing three treatment...Ch. 12 - The following values are from an...Ch. 12 - A research report from an independent-measures...Ch. 12 - Several factors influence the size of the F-ratio....Ch. 12 - A researcher used ANOVA and computed F = 4.25 for...Ch. 12 - The following Data were obtained from an...Ch. 12 - For the preceding problem you should find that...Ch. 12 - The following data summarize the results from an...Ch. 12 - To create the following data we started with the...Ch. 12 - An ANOVA produces an F-ratio with df 1.34. Could...Ch. 12 - The following scores are from an independent...
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- 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. One issue is that BMI, which may vary among ethnic groups, is positively related to hypertension. Hence, a logistic regression model was run, as shown in Table 13.55. 13.89 What is the estimated OR for hypertension comparing Hispanic boys vs. Caucasian boys based on the results in Table 13.55? (Call this OR2 .) Provide a 95% CI for this estimate. 13.90 Suppose the average BMI of Hispanic boys is higher than that for Caucasian boys. Is BMI a confounder of the association between ethnic group and hypertension? If so, is it…arrow_forwardwhether cross-sectional, retrospective, or prospective is used. Rats with cancer are divided into two groups. One group receives 5 mg f mediation that is thought to fight cancer, and the other receives 10 mg. After 2 years, the spread of the cancer is measured.arrow_forwardIn a popular with o=5,a score of X =46 corresponds to a z-score of z =+0.40.What is the population mean? u=41 u=40 u=48 u=44arrow_forward
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