Questions from Essentials of Statistics

Q: As reported by the U.S. Census Bureau in the

As reported by the U.S. Census Bureau in the document Educational Attainment in the United States, the percentage of adults in each state and the District of Columbia who have completed a bachelor’s d...

Q: Use your result from Exercise 11.132 to show that a

Use your result from Exercise 11.132 to show that a (1 − α) level confidence interval for the difference between two population proportions that has a margin of error of at most E can be obtained by c...

Q: Suppose that you can make reasonably good educated guesses, pˆ1g and

Suppose that you can make reasonably good educated guesses, pˆ1g and pˆ2g, for the observed values of pˆ1 and pˆ2. a. Use your result from Exercise 11.132 to show that a (1 − α)-level confidence inter...

Q: Refer to the study on ordering vegetarian. a. Obtain

Refer to the study on ordering vegetarian. 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 o...

Q: Refer to the study on ordering vegetarian. a. Without

Refer to the study on ordering vegetarian. a. Without making a guess for the observed values of the sample proportions, find the common sample size that will ensure a margin of error of at most 0.01 f...

Q: Repeat Exercise 11.136 by applying the formula in Exercise 11

Repeat Exercise 11.136 by applying the formula in Exercise 11.134(a) if you can reasonably presume that at most 41% of the men sampled and at most 49% of the women sampled will be people who sometimes...

Q: Prerequisite to this exercise are Exercises 11.9–11.

Prerequisite to this exercise are Exercises 11.9–11.13. What do your graphs in parts (c) of those exercises illustrate about the impact of increasing sample size on sampling error? Explain your answer...

Q: From Wikipedia’s on-line document “List of First Overall NBA

From Wikipedia’s on-line document “List of First Overall NBA Draft Picks,” we found that, since 1947, 10.4% of the number-one draft picks in the National Basketball Association have been other than U....

Q: From the U.S. Census Bureau document America’s Families and

From the U.S. Census Bureau document America’s Families and Living Arrangements and an article in Time magazine, we found that, in 1963, 83.0% of American women between the ages of 25 and 54 were marr...

Q: A Harris Poll asked Americans whether states should be allowed to conduct

A Harris Poll asked Americans whether states should be allowed to conduct random drug tests on elected officials. Of 21,355 respondents, 79% said “yes.” a. Determine the margin of error for a 99% conf...