8th Edition

ISBN: 9781305268920

Author: Bernard Rosner

Publisher: Cengage Learning

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In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.

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Textbook Question

Chapter 7, Problem 34P

The proportion of deaths due to lung cancer in males ages 15-64 in England and Wales during the period 1970-1972 was 12%. Suppose that of 20 deaths that occur among male workers in this age group who have worked for at least 1 year in a chemical plant, 5 are due to lung cancer. We wish to determine whether there is a difference between the proportion of deaths from lung cancer in this plant and the proportion in the general population.

One criticism of studies of this type is that they are biased by the “healthy worker” effect. That is, workers in general are healthier than the general population, particularly regarding cardiovascular endpoints, which makes the proportion of deaths from noncardiovascular causes seem abnormally high.

If the proportion of deaths from ischemic heart disease (IHD) is 40% for all 15- to 64-year-old men in England and Wales, whereas 18 of the preceding 90 deaths are attributed to IHD, then answer Problem 7.33 if deaths caused by IHD are excluded from the total.

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Chapter 7 Solutions

Fundamentals of Biostatistics

Ch. 7.3 - What is the difference between a type I and type...Ch. 7.3 - What is the difference between the critical-value...Ch. 7.3 - Several studies have shown that women with many...Ch. 7.7 - In the BMD study referred to in Case Study 2 (p....Ch. 7.7 - Prob. B.2RE Ch. 7.7 - Prob. B.3RE Ch. 7.9 - Prob. C.1RE Ch. 7.9 - Prob. C.2RE Ch. 7.9 - How much power did the test in Review Question...Ch. 7 - The mean serum-creatinine level measured in 12...

Ch. 7 - The mean serum-creatinine level measured in 12...Ch. 7 - The mean serum-creatinine level measured in 12...Ch. 7 - The mean serum-creatinine level measured in 1 2...Ch. 7 - The mean serum-creatinine level measured in 12...Ch. 7 - The mean serum-creatinine level measured in 12...Ch. 7 - The mean serumcreatinine level measured in 12...Ch. 7 - The mean serumcreatinine level measured in 12...Ch. 7 - Plasma-glucose levels are used to determine the...Ch. 7 - Plasma-glucose levels are used to determine the...Ch. 7 - Plasma-glucose levels are used to determine the...Ch. 7 - Suppose the incidence rate of myocardial...Ch. 7 - Suppose the incidence rate of myocardial...Ch. 7 - Suppose the incidence rate of myocardial...Ch. 7 - Suppose the incidence rate of myocardial...Ch. 7 - Suppose the incidence rate of myocardial...Ch. 7 - Suppose the annual incidence of asthma in the...Ch. 7 - Prob. 18P Ch. 7 - Suppose the annual incidence of asthma in the...Ch. 7 - Prob. 20P Ch. 7 - Ribosomal 5S RNA can be represented as a sequence...Ch. 7 - Ribosomal 5S RNA can be represented as a sequence...Ch. 7 - Ribosomal 5S RNA can be represented as a sequence...Ch. 7 - Ribosomal 5S RNA can be represented as a sequence...Ch. 7 - Ribosomal 5S RNA can be represented as a sequence...Ch. 7 - Suppose we identify 50 women 50 to 54 years of age...Ch. 7 - The drug erythromycin has been proposed to...Ch. 7 - A pilot study of a new antihypertensive agent is...Ch. 7 - A pilot study of a new antihypertensive agent is...Ch. 7 - The proportion of deaths due to lung cancer in...Ch. 7 - The proportion of deaths due to lung cancer in...Ch. 7 - The proportion of deaths due to lung cancer in...Ch. 7 - The proportion of deaths due to lung cancer in...Ch. 7 - The proportion of deaths due to lung cancer in...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Iron-deficiency anemia is an important nutritional...Ch. 7 - Suppose a new test is proposed to identify...Ch. 7 - Suppose a new test is proposed to identify...Ch. 7 - Suppose a new test is proposed to identify...Ch. 7 - Suppose a new test is proposed to identify...Ch. 7 - Suppose a new test is proposed to identify...Ch. 7 - The mortality experience of 8146 male employees of...Ch. 7 - The mortality experience of 8146 male employees of...Ch. 7 - The mortality experience of 8146 male employees of...Ch. 7 - The mortality experience of 8146 male employees of...Ch. 7 - Researchers have reported that the incidence rate...Ch. 7 - Researchers have reported that the incidence rate...Ch. 7 - Researchers have reported that the incidence rate...Ch. 7 - Researchers have reported that the incidence rate...Ch. 7 - Left ventricular mass (LVM) is an important risk...Ch. 7 - Left ventricular mass (LVM) is an important risk...Ch. 7 - Left ventricular mass (LVM) is an important risk...Ch. 7 - Left ventricular mass (LVM) is an important risk...Ch. 7 - Prob. 60P Ch. 7 - Previous studies have shown that supplementing the...Ch. 7 - Prob. 62P Ch. 7 - Prob. 63P Ch. 7 - Previous studies have shown that supplementing the...Ch. 7 - Prob. 65P Ch. 7 - Prob. 66P Ch. 7 - Refer to Data Set NIFED.DAT at...Ch. 7 - The combination of photochemotherapy with oral...Ch. 7 - The combination of photochemotherapy with oral...Ch. 7 - The combination of photochemotherapy with oral...Ch. 7 - Prob. 72P Ch. 7 - Breast cancer is strongly influenced by a womans...Ch. 7 - Prob. 74P Ch. 7 - An investigator wants to test a new eye drop that...Ch. 7 - Prob. 76P Ch. 7 - Table 7.10 gives the itching scores reported by...Ch. 7 - Table 7.10 gives the itching scores reported by...Ch. 7 - Table 7.10 gives the itching scores reported by...Ch. 7 - Table 7.10 gives the itching scores reported by...Ch. 7 - Prob. 81P Ch. 7 - Prob. 82P Ch. 7 - Concurrent sexual partnerships are widely believed...Ch. 7 - Prob. 84P Ch. 7 - Prob. 85P Ch. 7 - Prob. 86P Ch. 7 - Consider the birthweight data in Example 7.2. What...Ch. 7 - Consider the birthweight data in Example 7.2. Now...Ch. 7 - Prob. 89P Ch. 7 - A screening program for neuroblastoma (a type of...Ch. 7 - A screening program for neuroblastoma (a type of...Ch. 7 - Prob. 92P Ch. 7 - Prob. 93P Ch. 7 - Prob. 94P Ch. 7 - Prob. 95P Ch. 7 - Prob. 96P Ch. 7 - An experiment was performed to assess the efficacy...Ch. 7 - Medical errors are common in hospitals throughout...Ch. 7 - Prob. 99P Ch. 7 - Prob. 100P Ch. 7 - Prob. 101P Ch. 7 - Prob. 102P Ch. 7 - Prob. 103P Ch. 7 - Prob. 104P Ch. 7 - Osteoporosis is an important cause of morbidity in...Ch. 7 - Osteoporosis is an important cause of morbidity in...Ch. 7 - Osteoporosis is an important cause of morbidity in...Ch. 7 - Prob. 108P Ch. 7 - Prob. 109P Ch. 7 - Prob. 110P Ch. 7 - Prob. 111P Ch. 7 - Prob. 112P Ch. 7 - Prob. 113P Ch. 7 - A study was conducted in Sweden to relate the age...Ch. 7 - A study was conducted in Sweden to relate the age...Ch. 7 - A study was conducted in Sweden to relate the age...Ch. 7 - Prob. 117P Ch. 7 - Prob. 118P Ch. 7 - Prob. 119P Ch. 7 - Prob. 120P Ch. 7 - Prob. 121P

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Solution Summary: The author concludes that there is no significant excess or deficit in the proportions of lung cancer among these workers once deaths due to ischemic heart diseases included.

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Chapter 7 Solutions