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Chapter 11: Q.11.1 (page 459)
In a newspaper or magazine of your choice, find a statistical study that contains an estimated population proportion.
The article was published in the January edition:
According to a research, in the yearpercent of workers are members of unions.
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Eating Out Vegetarian. Refer to the study on ordering vegetarian considered in Examples 11.8-11.10.
a. Obtain the margin of error for the estimate of the difference between the proportions of men and women who sometimes order veg by taking half the length of the confidence interval found in Example on page 473. Interpret your answer in words.
b. Obtain the margin of error for the estimate of the difference between the proportions of men and women who sometimes order veg by applying Exercise 11.132.
Racial Crossover. In the paper "The Racial Crossover in Comorbidity, Disability, and Mortality" (Demography, Vol. 37(3), pp. 267-283), N. Johnson investigated the health of independent random samples of white and African-American elderly (aged 70 years or older). Of the 4989 white elderly surveyed, 529 had at least one stroke, whereas 103 of the 906 African-American elderly surveyed - Lported at least one stroke. At the significance level, do the data suggest that there is a difference in stroke incidence between white and African-American elderly?
In discussing the sample size required for obtaining a confidence interval with a prescribed confidence level and margin of error, we made the following statement: "If we have in mind a likely range for the observed value of , then, in light of Fig. , we should take as our educated guess for the value in the range closest to "Explain why.
In this Exercise, we have given the number of successes and the sample size for a simple random sample from a population. In each case,
a. use the one-proportion plus-four z-interval procedure to find the required confidence interval.
b. compare your result with the corresponding confidence interval found in Exercise , if finding such a confidence interval was appropriate.
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In this Exercise, we have given the number of successes and the sample size for a simple random sample from a population. In each case,
a. use the one-proportion plus-four -interval procedure to find the required confidence interval.
b. compare your result with the corresponding confidence interval found in Exercises , if finding such a confidence interval was appropriate.
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