Introductory Combinatorics
5th Edition
ISBN: 9780134689616
Author: Brualdi, Richard A.
Publisher: Pearson,
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Chapter 3, Problem 10E
To determine
To prove: There is some period of consecutive days in which the child watches exactly 20 hours of TV.
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Answer questions 8.2.11 and 8.2.12 respectively
8.4.2 An article in Knee Surgery, Sports Traumatology, Arthroscopy [“Arthroscopic Meniscal Repair with an
Absorbable Screw: Results and Surgical Technique” (2005, Vol.
13, pp. 273–279)] showed that only 25 out of 37 tears (67.6%)
located between 3 and 6 mm from the meniscus rim were healed.
a. Calculate a two-sided 95% confidence interval on the proportion of such tears that will heal.
b. Calculate a 95% lower confidence bound on the proportion of such tears that will heal.
8.4.3 An article in the Journal of the American Statistical Association [“Illustration of Bayesian Inference in Normal Data Models Using Gibbs Sampling” (1990, Vol. 85, pp.
972–985)] measured the weight of 30 rats under experiment controls. Suppose that 12 were underweight rats.
a. Calculate a 95% two-sided confidence interval on the true
proportion of rats that would show underweight from the
experiment.
b. Using the point estimate of p obtained from the preliminary sample, what sample size is needed to be 95%…
8.4.8 Use the data from Exercise 8.4.2 to compute the two-sided
Agresti-Coull CI on the proportion of tears that heal. Compare
and discuss the relationship of this interval to the one computed
in Exercise 8.4.2.
Chapter 3 Solutions
Introductory Combinatorics
Ch. 3 - Prob. 1ECh. 3 - Prob. 2ECh. 3 - Prob. 3ECh. 3 - Prob. 4ECh. 3 - Prob. 5ECh. 3 - Prob. 6ECh. 3 - Prob. 7ECh. 3 - Use the pigeonhole principle to prove that the...Ch. 3 - Prob. 9ECh. 3 - A child watches TV at least one hour each day for...
Ch. 3 - A student has 37 days to prepare for an...Ch. 3 - Show by example that the conclusion of the Chinese...Ch. 3 - *Let S be a set of six points in the plane, with...Ch. 3 - Prob. 14ECh. 3 - Prove that, for any n + 1 integers a1, a2,…,an+1,...Ch. 3 - Prob. 16ECh. 3 - There are 100 people at a party. Each person has...Ch. 3 - Prove that of any five points chosen within a...Ch. 3 - Prove that of any five points chosen within an...Ch. 3 - Prove that r(3, 3, 3) ≤ 17.
Ch. 3 - Prove that r(3, 3, 3) ≥ 17 by exhibiting a...Ch. 3 - Prob. 22ECh. 3 - Prob. 23ECh. 3 - Prob. 24ECh. 3 - Prob. 25ECh. 3 - Prob. 26ECh. 3 - A collection of subsets of {1, 2, …, n} has the...Ch. 3 - At a dance party there are 100 men and 20 women....Ch. 3 - Prob. 29E
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- Answer questions 8.3.7 and 8.4.1 respectivelyarrow_forwardDon't do 14. Please solve 19arrow_forward8.4.7 Use the data from Exercise 8.4.5 to compute the two-sided Agresti-Coull CI on the proportion of digits read correctly. Compare and discuss the relationship of this interval to the one computed in Exercise 8.4.5.arrow_forward
- 8.6.5 Consider the fuel rod enrichment data described in Exercise 8.2.11. Compute a 90% prediction interval on the enrichment of the next rod tested. Compare the length of the prediction interval with the length of the 99% CI on the population mean.arrow_forward8.4.4 The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed limits from 65 mph to 75 mph. How many residents does the department need to survey if it wants to be at least 99% confident that the sample proportion is within 0.05 of the true proportion? 8.4.5 The U.S. Postal Service (USPS) has used optical character recognition (OCR) since the mid-1960s. In 1983, USPS began deploying the technology to major post offices throughout the country (www.britannica.com). Suppose that in a random sample of 500 handwritten zip code digits, 466 were read correctly. a. Construct a 95% confidence interval for the true proportion of correct digits that can be automatically read. b. What sample size is needed to reduce the margin of error to 1%? c. How would the answer to part (b) change if you had to assume that the machine read only one-half of the digits correctly?arrow_forwardAnswer questions 8S7 and 8S14arrow_forward
- Answer questions 8.2.9 and 8.2.10 respectivelyarrow_forwardAnswer questions 8.3.5 and 8.3.6 respectivelyarrow_forward8.6.4 Consider the test on the compressive strength of concrete described in Exercise 8.2.9. Compute a 90% prediction interval on the next specimen of concrete tested. 8.6.5 . SS Consider the fuel rod enrichment data described in Exercise 8.2.11. Compute a 90% prediction interval on the enrichment of the next rod tested. Compare the length of the prediction interval with the length of the 99% CI on the population mean.arrow_forward
- Answer questions 8S10 and 8S11 respectively.arrow_forward8.4.6 Information on a packet of seeds claims that 93% of them will germinate. Of the 200 seeds that were planted, only 180 germinated. a. Find a 95% confidence interval for the true proportion of seeds that germinate based on this sample. b. Does this seem to provide evidence that the claim is wrong? 8.6.1 Consider the tire-testing data described in Exercise 8.2.3. Compute a 95% prediction interval on the life of the next tire of this type tested under conditions that are similar to those employed in the original test. Compare the length of the prediction interval with the length of the 95% CI on the population mean.arrow_forwardPlease solve 14 and 15arrow_forward
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