Out of 400 people sampled, 172 had children. Based on this,construct a 90% confidence interval for the true populationproportion of people with children.Preliminary:a. Is it safe to assume that n < 5% of all people withchildren?NoYesb. Verify np (1 - p) ≥ 10. Round your answer to onedecimal place.np (1 - p)=Confidence Interval: What is the 90% confidence interval toestimate the population proportion? Round your answer tothree decimal places.

The formula to calculate for the confidence interval for proportion is C.I.=p^±zα/2np^(1−p^)…

Answered: Out of 400 people sampled, 172 had…

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 proportion confidence interval problem resulted in the following interval as the answer: ( 0.5648 , 0.6048 ). A sample taken yielded the proportion to be 0.5848. What is the margin of error to the nearest percent?
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Virginia wants to estimate the percentage of students who live more than three miles from the school. She wants to create a 95% confidence interval which has a margin of error of at most 5%. How many students should be polled to create the confidence interval? z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of values above.
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If n 560 and p 0.5, construct a 90% confidence interval about the population proportion. Round your answers to three decimal places. 4 Preliminary: a. Is it safe to assume that n 10. Round your answer to one decimal place. np (1-P) = Confidence Interval: What is the 90% confidence interval to estimate the population proportion? Round your answer to three decimal places.
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A new fertilizer was applied to the soil of 239 bean plants. 11% showed increased growth. Find the margin of error and 95% confidence interval for the percentage of all bean plants which show increased growth after application of the fertilizer. Round all answers to 2 decimal places. Margin of Error (as a percentage): Confidence Interval:
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How to calculate a 90% confidence interval?

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