all sample: Ninteen concrete blocks were sampled and tested for crushing strength in order to estimate the proportion that were sufficiently strong for ain application. Seventeen of the 19 blocks were sufficiently strong. Use the small-sample method to construct an 80% confidence interval for the proportioocks that are sufficiently strong. Round the answers to at least three decimal places.n 80% confidence interval for the proportion of blocks that are sufficiently strong is

Sample size n=19Favorable cases x=17Sample proportion p^=x/n=17/19=0.8947

Answered: mple: Ninteen concrete blocks were…

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 flower shop owner wants to estimate the proportion of people who enter the store that make a purchase. They want a 95% confidence interval on the proportion of people who enter the store that make a purchase with a margin for error of 0.04 or 4%. Their partner estimates that 20% (a proportion of 0.2) of the people who enter the store make a purchase so the owner will use that value when determining the sample size. What sample size should the flower shop take?
In a sample of 44 water specimens taken from a construction site, 27 contained detectable levels of lead. Construct an 80% confidence interval for the proportion of water specimens that contain detectable levels of lead. Round the answer to at least three decimal places.
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In a sample of 44 water specimens taken from a construction site, 27 contained detectable levels of lead. Construct a 95% confidence interval for the proportion of water specimens that contain detectable levels of lead. Round the answer to at least three decimal places.
The population standard deviation for the height of college football players is 2.7 inches. If we want to estimate a 95% confidence interval for the population mean height of these players with a 0.65 margin of error, how many randomly selected players must be surveyed
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