A random survey found that 220 out of 300 adults living in large cities (with populations of more than 1million) wanted more state funding for public transportation. In small cities (with populations fewer than100,000), 120 out 300 adults surveyed wanted more state funding. Call the population of adults living in largecities "Population 1" and the population of adults living in small cities "Population 2" while working theseproblems. With a 90% confidence level, what is the confidence interval for the difference in the populationproportions? Give your answer to four decimal places.

We have given that Sample size n1= 300 , n2= 300 Favorable cases x1= 220 , x2= 120 I want to find…

Answered: A random survey found that 220 out of…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Suppose you are with a health agency that wants to estimate what percentage of Ohioans reallyhas contracted coronavirus and thus has antibodies. If your agency wants a 2% margin of errorat a 95% confidence level, how many people should you have in your study?
Top management of a large multinational corporation wants to create a culture of innovativeness and change. A consultant hired to assess the company's organizational culture finds that only 15% of employees are open to new ideas and approaches toward their work. Consequently the company conducts a program for employees in order to reinforce the new corporate philosophy. Based on data collected after the program, they find the 95% confidence interval for the proportion of all employees open to new ideas to be 18% to 22%. What should the company conclude? ... O A. There is no evidence to suggest that the program improved employees' attitudes toward innovativeness and change. B. There is evidence that the program improved employees' attitudes toward innovativeness and change. C. The null hypothesis should not be rejected. OD. Both A and B OE. Both A and C
In a study on drug use in the prison population carried out in 2006, it was found that 63% of inmates had consumed alcohol one month before entering prison. In a new survey of 4,985 inmates conducted in 2011, 3,227 reported having consumed alcohol in the 30 days prior to admission. Knowing that the population in 2011 was 71,387 individuals, we want to know with a confidence level of 98% if the percentage of inmates has suffered differences during the considered period. Calculate the p-value and interpret the value obtained
If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by consumers, how could a business use this result in making a marketing statement about their product?
A researcher finds that individuals with a high school education or less are more likely to have hypertension than individuals with at least some college education. They report a relative risk of 2.1 with a 95% confidence interval or (1.6, 2.5). They then stratify their analysis by smoking status and report a relative risk of hypertension in smokers with a high school education or less as compared to smokers with at least some college education of 1.4 with a 95% confidence interval of (0.9, 1.9), and a relative risk of hypertension in non-smokers with a high school education or less as compared to non-smokers with at least some college education of 2.6 with a 95% confidence interval of (2.1, 3.2), Which of the following is not true? A) there is effect modification by smoking status B) there is effect modification by hypertension status C) there is no statistically significant assocation between education and hypertension amoung smokers D) Education and hypertension are not…
Come up with your own data for a problem that would ask for a 90% confidence interval utilizing Z. Clearly label your variables.
The security of two software systems are compared. A total of 225 security tests (fake attacks) were carried out on System 1 and, in 100 of them, the system was unaffected. On the other hand, 175 tests were conducted on System 2 and, in 40 of them, the system remained unaffected. Help test engineers decide whther there is a meaningful difference between the security levels of two systems (measured by the proportion of unsuccessful attacks) by building a confidence interval. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. With 99% confidence, the engineers can conclude that the difference among security levels p, - p2 will be between and (Round to three decimal places including any zeros.) Obviously, the interval V This means, the case p, - P2 = 0 excluded from 99% of all possible values p, - p2 can take. 0. P1 - P2- P2- P1 The security of two software systems are compared. A total of 225 security…
A university health services physician is concerned about how much sleep freshman are getting. She asked a simple random sample of 100 students if they got at least 8 hours of sleep the previous night. then she constructs a 90% confidence interval for the true proportion of all freshman college students who got at least 8 hours of sleep the previous night. Explain what would happen to the width of the interval if the confidence level were increased to 95%
A university health services physician is concerned about how much sleep freshman are getting. She asked a simple random sample of 100 students if they got at least 8 hours of sleep the previous night. then she constructs a 90% confidence interval for the true proportion of all freshman college students who got at least 8 hours of sleep the previous night. Explain what would happen to the width of the interval if the sample size would decrease to 25 students
2. An experiment showed that 52 teenage subjects dreamed in black and white & 175 of them dreamed in colors. Another study on old-age adults showed that 5 dreamed in black and white & 40 of them dreamed in colors. Find the 95% confidence interval for the difference between the rates who dreamed in black and white and those in colors. please show how to solve it. no excel please.
7) Suppose that in a sample of 5274 customers at a food store, 2468 food shop more than once a week. Find a 98% confidence interval for the population proportion of customers who shop more than once a week. Interpret your answer.
The dean of students at a large college is interested in learning about their opinions regarding the percentage of first-year students who should be given parking privileges in the main lot. He sends out an email survey to all students about this issue. A large number of first-year students reply but very few sophomores, juniors, and seniors reply. Based on the responses he receives, he constructs a 90% confidence interval for the true proportion of students who believe first-year students should be given parking privileges in the main lot to be (0.71, 0.79). Which of the following may have an impact on the confidence interval, but is not accounted for by the margin of error? response bias O nonresponse bias O sampling variation O undercoverage bias

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