Q1:Let p equal the proportion of drivers who use a seat belt in a country that does not have amandatory seat belt law. It was claimed that p = 0.14. An advertising campaign wasconducted to increase this proportion. Two months after the campaign, y = 104 out of arandom sample ofn = 590 drivers were wearing their seat belts.The null and alternative hypotheses are given by

Given, p = proportion of drivers who use a seat belt in a country that does not have a mandatory…

Answered: Q1:Let p equal the proportion of…

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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Among 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300 said they were current smokers. b. Estimate the variability in such sample proportion by finding SE (p).
Assume that the Controller's office implemented a policy in January 2014 to increase the proportion of part-time city employees in order to cut costs. Suppose that the office had access to the survey conducted by the advocacy group in June 2014 and wanted to use this survey to gauge the effect of this policy on p, the proportion of full-time employees, as of June 2014. If the Controller's office planned to use a one-sample z-test for a proportion to test the effect of their policy, the appropriate null hypothesis would be and the appropriate alternative hypothesis would be In 2014, the U.S. Centers for Disease Control and Prevention reported that 9.3% of Americans had diabetes in 2013. Assume that the Los Angeles Controller's office wanted to determine if the same proportion of the employees of the City of Los Angeles were diabetic. Suppose that they surveyed a random sample of 250 employees in June 2014 and found that 26 were diabetic. If the Controller's office planned to use a…
An airline claims that luggage is rarely lost (does not arrive at the destination at the same time as the passenger). The airline claims that if luggage is lost, in 87% of cases the airline is able to recover and deliver the luggage within 24 hours. A consumer watchdog group found a random sample of 125 people whose luggage was lost and found that 99 of them had their luggage recovered and returned within 24 hours. The Sample proportion p-hat is 99/125 = 0.792. The watchdog group wants to perform a hypothesis test against the claim that the airline is able to recover 87% of lost luggage in 24 hours. What is the test statistic?
Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.4. What is the p-value when testing the hypothesis that the actual proportion of orange for all Reese's pieces is 0.5? Round to two places.
if the 90% Ci for the population mean is ( -2.58, 7.54) what is the sample mean О a. 2.48 Оb. 10.12 O c. 5.06 O d. can't be found
According to the Humane Society, 33% of households in the United States own at least one cat. You are interested in determining whether the proportion of households of the students at your school that own at least one cat is different from the national proportion. Suppose you survey an SRS of students at your school and find that 25% of them own cats, which yields a p-value of .092. Interpret this p-value.
4. A researcher claims that the percentage of infants who receiveimmunizations is less than 80%. She selects a sample of size 750 infantsand 573 have received immunizations. c. Compute the P-value based on your test statistic.
Suppose a one sided test for a proportion resulted in a p-value of 0.06. What would the p-value be if the test were two tail test? Select one: A. It would still be 0.06. B. It would be 0.3. C. It would be 0.12. D. There is no way to calculate this without completely redoing the original test with a new alternative hypothesis.
5t. A magazine reports that women trust recommendations from a particular social networking site more than recommendations from any other social network platform. But does trust in this social networking site differ by gender? The following sample data show the number of women and men who stated in a recent sample that they trust recommendations made on this particular social networking site. Women Men Sample 150 170 Trust RecommendationsMade on the social networking site 111 102 (a) What is the point estimate of the proportion of women who trust recommendations made on this particular social networking site? (b) What is the point estimate of the proportion of men who trust recommendations made on this particular social networking site? (c) Provide a 95% confidence interval estimate of the difference between the proportion of women and men who trust recommendations made on this particular social networking site. (Round your answers to four decimal places.)
18. The governor of New York has banned selling or purchasing "large" soft drinks, where a "large" is defined as being more than 16 oz. Sonic, famous for its Route 44 drinks is interested in estimating the proportion of New Yorkers that favor this ban. From a random survey of 800 New Yorkers, 375 answered no to the question, “Do you favor the governor's ban on 'large' soft drinks?" a. Find a 97.5% confidence interval for the proportion of New Yorkers who favor the ban on "large" soft drinks. b. Interpret the confidence interval. c. Can you conclude with 97.5% confidence that a majority of New Yorkers favor the ban on "large" soft drinks? Why or why not. d. Without doing any other calculations, can you be 99% confident that a majority of New Yorkers favor the ban on “large" soft drinks?

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