STATS:DATA+MODELS-W/DVD
STATS:DATA+MODELS-W/DVD
4th Edition
ISBN: 9780321986498
Author: DeVeaux
Publisher: PEARSON
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2-Proportion Test
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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Chapter 20, Problem 26E

(a)

To determine

Explain how the 95% interval will be better for the city.

(b)

To determine

Explain why the 95% confidence interval will be worse for the planners.

(c)

To determine

Explain how the planners can achieve better interval estimate for planning needs.

d.

To determine

Find the number of days’ worth of information needed to be surveyed to estimate the mean to within $3 with 95% confidence interval.

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Chapter 20 Solutions

STATS:DATA+MODELS-W/DVD

Ch. 20.2 - Every 10 years, the United States takes a census....Ch. 20.2 - Every 10 years, the United States takes a census....Ch. 20.2 - Prob. 3JCCh. 20.2 - Prob. 4JCCh. 20.2 - Prob. 5JCCh. 20.2 - In discussing estimates based on the long-form...Ch. 20 - Prob. 1ECh. 20 - 2. LSAT The LSAT (a test taken for law school...Ch. 20 - 7. t-models, part I Using the t tables, software,...Ch. 20 - 8. t-models, part II Using the t tables, software,...
Ch. 20 - 9. t-models, part III Describe how the shape,...Ch. 20 - 10. t-models, part IV Describe how the critical...Ch. 20 - 11. Home sales The housing market recovered slowly...Ch. 20 - 12. Home sales again In the previous exercise, you...Ch. 20 - 15. Cattle Livestock are given a special feed...Ch. 20 - 16. Teachers Software analysis of the salaries of...Ch. 20 - 23. Pulse rates A medical researcher measured the...Ch. 20 - Prob. 20ECh. 20 - 25. CEO compensation A sample of 20 CEOs from the...Ch. 20 - 26. Credit card charges A credit card company...Ch. 20 - 29. Normal temperature The researcher described in...Ch. 20 - 30. Parking Hoping to lure more shoppers downtown,...Ch. 20 - 25. Normal temperatures, part II Consider again...Ch. 20 - Prob. 26ECh. 20 - 33. Speed of light In 1882, Michelson measured the...Ch. 20 - Prob. 29ECh. 20 - Prob. 30ECh. 20 - Prob. 31ECh. 20 - Prob. 32ECh. 20 - Prob. 33ECh. 20 - Prob. 34ECh. 20 - Prob. 35ECh. 20 - 42. Computer lab fees The technology committee has...Ch. 20 - Prob. 39ECh. 20 - Prob. 40ECh. 20 - 57. Popcorn Yvon Hopps ran an experiment to...Ch. 20 - Prob. 42ECh. 20 - Prob. 43ECh. 20 - Prob. 44ECh. 20 - 61. Maze Psychology experiments sometimes involve...Ch. 20 - Prob. 46ECh. 20 - Prob. 47ECh. 20 - 48. Wind power Should you generate electricity...Ch. 20 - Prob. 9ECh. 20 - Prob. 10ECh. 20 - Prob. 11ECh. 20 - Prob. 12ECh. 20 - Prob. 13ECh. 20 - Prob. 14ECh. 20 - Prob. 17ECh. 20 - Prob. 18ECh. 20 - Prob. 28ECh. 20 - Prob. 37ECh. 20 - 38. Saving gas Congress regulates corporate fuel...
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