The workers at a certain company took a random sample of 800 manhole covers and found that 40 of themwere defective. Which of the following gives the 95% confidence interval for the true proportion of manholecovers that are defective?O [.047, .053]O [,015, .085]O [.035, .065]O [026, .043]

Answered: Image /qna-images/answer/61793d10-16db-44f4-8873-483ff6fbf673.jpg

Answered: The workers at a certain company took a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A smart phone manufacturer is interested in constructing a 99% confidence interval for the proportion of smart phones that break before the warranty expires. 83 of the 1621 randomly selected smart phones broke before the warranty expired. Round answers to 4 decimal places where possible. a. With 99% confidence the proportion of all smart phones that break before the warranty expires is between ______ and ______. b. If many groups of 1621 randomly selected smart phones are selected, then a different confidence interval would be produced for each group. About________ percent of these confidence intervals will contain the true population proportion of all smart phones that break before the warranty expires and about________ percent will not contain the true population proportion.
Identify the t score for a 99% confidence interval if the sample size is 35 t=

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The workers at a certain company took a random sample of 800 manhole covers and found that 40 of them were defective. Which of the following gives the 95% confidence interval for the true proportion of manhole covers that are defective? O [.047, .053] O [.015, .085] O [.035, .065] O [.026, .043]