A magazine provided results from a poll of 2000 adults who were asked to identify their favorite pie. Among the 2000 respondents, 12% chose chocolate pie, and themargin of error was given as ±3 percentage points. Given specific sample data, which confidence interval is wider: the 90% confidence interval or the 80% confidenceinterval? Why is it wider?Choose the correct answer below.O A. An 80% confidence interval must be wider than a 90% confidence interval in order to be more confident that it captures the true value of the populationproportion.O B. A 90% confidence interval must be wider than an 80% confidence interval in order to be more confident that it captures the true value of the populationproportion.O C. A 90% confidence interval must be wider than an 80% confidence interval because it contains 90% of the true population parameters, while the 80%confidence interval only contains 80% of the true population parameters.O D. An 80% confidence interval must be wider than a 90% confidence interval because it contains 100% - 80% = 20% of the true population parameters, while the90% confidence interval only contains 100% - 90% = 10% of the true population parameters.

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Answered: A magazine provided results from a poll…

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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In exploring possible sites for a convenience store in a large neighbourhood, the retail chain wants to know the proportion of ratepayers in favour of the proposal. If the estimate is required to be within 0.1 of the true proportion, would a random sample of size n = 100 from the council records be sufficient for a 95% confidence interval of this precision?
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A company reported that 95% confidence interval for the proportion of household whoalready own a personal computer was (0.1894, 0.2906). How large of a sample shouldbe selected if the value of the sample proportion obtained from a preliminary sample is0.24? (Round up your answer to the nearest whole number).
A November 2018 CBS News Poll found that 35% of its sample planned to use online retailers for most holiday shopping. Give a 95% confidence interval for the proportion of all adults who plan to shop in this way, assuming that the result ˆp=0.35 comes from a sample size n= 650 n=1800 n=500 Explain briefly what your results show about the effect of increasing the size of a sample on the width of the confidence interval.
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A 95% confidence interval for the proportion of college students who have texted during class was found to be from 0.75 to 0.95. Which of the following must be the 90% confidence interval from the same sample of data? 1. 0.05 to 0.25 2. 0.777 to 0.9 3. 0.731 to 0.969 4 0.766 to 0.934
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Based on sample data, the 95% confidence interval for the population mean is about $150 to $250. If the α = 0.05 level of significance was used in testing Ho: µ = $260 versus H1: µ ≠ $260, the null hypothesis. Would the null hypothesis be rejected or not?

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