ParagraphStyles8. Suppose that a market research firm is hired to estimate the percent of adults livingin a large city who have cell phones. Five hundred randomly selected adult residentsin this city are surveyed to determine whether they have cell phones. Of the 500people surveyed, 421 responded yes - they own cell phones. Using a 95%confidence level, compute a confidence interval estimate for the true proportion ofadult residents of this city who have cell phones. (Round final answer to 4 decimalplaces)9. The breaking strengths of cables produced by a manufacturer have a mean of 1800pounds (Ib) and a standard deviation of 100 lb. By a new technique in themanufacturing process, it is claimed that the breaking strength can be increased. Totest this claim, a sample of 50 cables is tested and it is found that the mean breakingstrength is 1850 lb. Can we support the claim at the 0.01 significance level?a) State the hypothesesb) State the level of significancec) State the decision rule (Sampling distribution)d) Calculate the test statistice) State the critical regions, decision and the conclusionOFOCLFext Predictions: OnR Accessibility: Unavailable

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Advanced Engineering Mathematics

10th Edition

ISBN:9780470458365

Author:Erwin Kreyszig

Publisher:Erwin Kreyszig

Chapter2: Second-order Linear Odes

Section: Chapter Questions

Problem 1RQ

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A researcher finds that individuals with a high school education or less are more likely to have hypertension than individuals with at least some college education. They report a relative risk of 2.1 with a 95% confidence interval or (1.6, 2.5). They then stratify their analysis by smoking status and report a relative risk of hypertension in smokers with a high school education or less as compared to smokers with at least some college education of 1.4 with a 95% confidence interval of (0.9, 1.9), and a relative risk of hypertension in non-smokers with a high school education or less as compared to non-smokers with at least some college education of 2.6 with a 95% confidence interval of (2.1, 3.2), Which of the following is not true? A) there is effect modification by smoking status B) there is effect modification by hypertension status C) there is no statistically significant assocation between education and hypertension amoung smokers D) Education and hypertension are not…
A market research firm is hired to estimate the percent of adults living in a large city who have cell phones. The firm randomly selects 450 adult residents to determine whether they have cell phones. Of the 450 people sampled, 381 own cell phones. Compute a 90% confidence interval for the true proportion of adult residents of this city who have cell phones. Round the answer to three decimal places.
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