An environmental agency worries that many cars may be violating clean air emissions standards. The agency hopes tocheck a sample of vehicles in order to estimate that percentage with a margin of error of 5% and 95% confidence. Togauge the size of the problem, the agency first picks 50 cars and finds 9 with faulty emissions systems. How manyshould be sampled for a full investigation?The environmental agency should sample at least(Round up to the nearest whole number.)vehicles.

From the provided information, it is interpreted that: The sampled no. of cars, n=50. The no. of…

Answered: An environmental agency worries that…

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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Similar questions

An auto-parts store offers a fuel additive that claims to increase a vehicle’s gas mileage. The additive is poured into a vehicle’s gasoline tank after the tank is filled. To measure the claim, two methods to collect data are proposed.
In each of Exercises, explain the effect on the margin of error and hence the effect on the accuracy of estimating a population mean by a sample mean. Increasing the sample size while keeping the same confidence level
A group of students need to submit a project and they need to survey people about their daily routine. How many people should they survey in order to be 95% confident that the estimated ( sample) proportion is within three percentage points of the true population? Assume that pq= 0.25
A sobriety test is 96% accurate. Suppose 2500 drivers were pulled over on suspicion ofintoxication, and suppose 12% of people pulled over were actually intoxicated (and the restwere sober). 1. What percentage of sober drivers failed the sobriety test? 2. What percentage of drivers who failed the sobriety test were sober? 3. What percentage of drivers who passed the sobriety test were intoxicated?
A pollster wishes to estimate the number of left-handed scientists. How large a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 4%? A previous study indicates that the proportion of left-handed scientists is 8%.
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 40%. You would like to be 99% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required?
An educator desires to estimate, within 4%, the true percentage of high school students who study at least 1 hour each school night. He wants to be 95% confident. How large a sample is necessary?
A health organization wants to estimate the population proportion of Ohioans who have received the flu vaccine this year. Before starting this study, they need to know how many Ohioans need to be surveyed to be 99% confident that they are within 4% of the true population proportion. What is the sample size needed for this study?
A magazine provided results from a poll of 1500 adults who were asked to identify their favorite pie. Among the 1500 respondents, 14% chose chocolate pie, and the margin of error was given as ±5 percentage points. Describe what is meant by the statement that "the margin of error was given as ±5 percentage points." Choose the correct answer below. A. The statement indicates that the study is only 5% confident that the true population percentage of people that prefer chocolate pie is exactly 14%. B. The statement indicates that the true population percentage of people that prefer chocolate pie is in the interval 14%±5%. C. The statement indicates that the interval 14%±5% is likely to contain the true population percentage of people that prefer chocolate pie.
Find the sample size required to estimate the percentage of statistics students who take their statistics course online. Assume that we want 95% confidence that proportion from the sample is within two percentage points of the true population percentage.
A researcher wishes to estimate the number of households with two computers. How large a sample is needed in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 6%? A previous study indicates that the proportion of households with two computers is 23%. Group of answer choices
Find the sample size required to estimate the percentage of statistics students who take their statistics course online. Assume that we want 95% confidence that proportion from the sample is within two percentage points of the true population percentage. Answer: Sample size n =

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