The American Heart Association is about to conduct an anti-smoking campaign and wants to know the fraction of Americans over 44 who smoke. In an earlier study, thepopulation proportion was estimated to be 0.2.How large a sample would be required in order to estimate the fraction of Americans over 44 who smoke at the 80 % confidence level with an error of at most 0.03?Round your answer up to the next integer.Answor

The objective is to determine the sample size.The formula of sample size is,Here, denotes…

Answered: The American Heart Association is about…

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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The Nielson television ratings used a sample of 2,000 homes to estimate the proportion of all homes that watch Monday Night football. A previous survey showed the proportion to be 45% (.45 ) of homes watched Monday Night Football. If a 99% confidence is required, what would the margin of error be with a new survey and making use of the old proportion. Round answer to the nearest percent.
A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=935 and x=561 who said "yes." Use a 95% confidence level.
Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=964 and x = 540 who said "yes." Use a 95% confidence level.
A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n = 1026 and x = 520 who said “yes." Use a 95% confidence level. Find the best point estimate of the population proportion p
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A survey asked, "How important is it to you to buy products that are made in America?" of the 600 Americans surveyed, 450 responded, "It is important." For each of the following levels of confidence, find the sample proportion and the margin of error (MOE) associated with the poll. (Give the answers to one decimal place, if needed.) A 95% level of confidenceSample proportion is %MOE = %
In a recent poll, 500 people were asked if they liked dogs, and 72% said they did. Find the margin of error of this poll, at the 95% confidence level. Give your answer to three decimals
Fear of the dark is quite common among children. However, what about adults? One polling agency released the results of a survey that asked people over 30 years old if they keep the lights on at night. Among 452 respondents, 34% indeed leave the light on when going to sleep. What does this margin of error tell you about the percentage of adults who keep the lights on at night? We can be 95% confident that somewhere between % and % of adults keep the lights on at night.
In a recent poll, 100 people were asked if they liked dogs, and 90% said they did. Find the margin of error of this poll, at the 95% confidence level.Give your answer to three decimals
Suppose we estimated that 68 percent of Santa Fe students believe that black coffee is disgusting. If we wanted to know the true proportion of the students who share the same view at 99 percent confidence and 4.5 percent margin of error, how many people would we need to sample?
You were interested in how long the average psychology major at your college studies per night, so you asked 10 psychology majors to tell you the amount they study. They told you the following times: 2, 1.5, 3, 2, 3.5, 1, 0.5, 3, 2, 4. (a) Find the 95% confidence interval on the population mean. (b) Find the 90% confidence interval on the population mean.
Vlad the Impaler promotes many of his soldiers into generals (don't ask what happened to the past generals). Haley thinks the proportion is about 79%, but wants to estimate the proportion better by sampling soldiers until her margin of error for a 93% Confidence Interval is less than 0.005. How many soldiers should Haley sample?

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