A sample survey of 852 adult Internet users found that 57% look for information on the online collaborative encyclopedia Wikipedia.(a) Give the standard error SE of p, the proportion of all adult Internet users who look for information on Wikipedia. (Round your answer to four decimal places.)SE = 0.0241X(b) Give a 95% large sample confidence interval for the proportion of all adult internet users who look for information on Wikipedia.O 0.519 to 0.621O 0.542 to 0.5980.527 to 0.613O 0.537 to 0.603x

Answered: A sample survey of 852 adult Internet…

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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Suppose a certain species bird has an average weight of x = 3.2 grams. Based on previous studies we can assume that the weights of these birds have a normal distribution with sigma = 0.34 grams. For a small group of 18 birds , find a 98% confidence interval for the average weights of these birds. Write answer in interval notation with two decimal places.
A 90% confidence interval for p is given as (0.26,0.54). How large was the sample used to construct this interval? (Round up to the nearest observation.)
Find a 95% confidence interval for H given that x = 75.8, s = 19, n = 10.
The researcher took a random sample of 50 residents and found that the mean height of men is 175cm. Suppose that the team is made aware of the fact that the distribution of heights is distributed normally. 1, The sample median is an unbiased estimate of the mean height of men. Is the following statement about the estimator true? 2, Determine whether or not the median or mean is an efficient estimator of the population median.
We wish to estimate what percent of adult residents in a certain county are parents. Out of 200 adult residents sampled, 150 had kids. Based on this, construct a 99% confidence interval for the proportion ππ of adult residents who are parents in this county.
According to statistics published by CNBC, the amount they are insured is surprising. CNBC's sample results indicate that 57 out of 84 vehicles were uninsured. Give a 95% confidence interval for the population proportion of the form p ± E where p is the point estimator of the proportion and E is the margin of error. Select one: a. The interval is 0.321 ± 0.100. b. The interval is 0.321 ± 0.084. c. The interval is 0.679 ± 0.100. d. The interval is 0.679 ± 0.131. e. The interval is 0.679 ± 0.084.
Suppose a confidence interval for pi - P2 was found to be (-0.15, -0.12). What is suggested by this interval?
We wish to estimate what percent of adult residents in a certain county are parents. Out of 100 adult residents sampled, 48 had kids. Based on this, construct a 90% confidence interval for the proportion ππ of adult residents who are parents in this county.
A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie. Among the 500 respondents, 13% chose chocolate pie, and the margin of error was given as ±4 percentage poits. Describe what is meant by the statement that "the margin of error was given as ±4 percentage points." (...) Choose the correct answer below. OA. The statement indicates that the study is only 4% confident that the true population percentage of people that prefer chocolate pie is exactly 13%. OB. The statement indicates that the study is 100% -4% = 96% confident that the true population percentage of people that prefer chocolate pie is 13%. OC. The statement indicates that the interval 13% ± 4% is likely to contain the true population percentage of people that prefer chocolate pie. D. The statement indicates that the true population percentage of people that prefer chocolate pie is in the interval 13% ± 4%.
In 2011 the U.S. Department of Transportation reported with 95% confidence that the average length of a motor vehicle trip in the United States was 9.72 miles with a margin or error of 0.22 miles. With 95% confidence the authors of the report are claiming that the true average length of a motor vehicle trip in the United States is between and miles. The level of confidence for this estimate is %.

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