
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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suppose that in sampling for the population proportion, it is found that 20 out of 100 items are defective. Construct a 95% confidence interval for the proportion of defective items in the population?
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- Out of 400 people sampled, 276 had kids. Based on this, construct a 90% confidence interval for the true population proportion of people with kids.arrow_forwardIn a survey of 1000 households, 800 had cell phones but no landline. Construct a 95% confidence interval for the proportion of all households with a cell phone but no landline.arrow_forwardSuppose a 90 percent confidence interval to estimate a population proportion was calculated from a sample proportion of 18 percent and a margin of error of 4 percent. What is the width of the confidence interval?arrow_forward
- 7) Suppose that in a sample of 5274 customers at a food store, 2468 food shop more than once a week. Find a 98% confidence interval for the population proportion of customers who shop more than once a week. Interpret your answer.arrow_forwardSuppose we know that a confidence interval for a population proportion is (0.105,0.355), with a sample proportion of p̂=0.23. What is the margin of error?arrow_forwardWhen 258 college students are randomly selected and surveyed, it is found that 106 own a car. Find a 99% confidence interval for the true proportion of all college students who own a car.arrow_forward
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