complete solution Please 1. Find pand 4: In a survey of 80 children, 48 like to watch horror films.2. Compute the margin of error of p given the following: Confidence level 97%, p 0.85, n 120.3. Compute the confidence interval estimate given the following: Confidence level 99 %, p= 0.4, n 40.4. In a survey participated by 100 college students, it was found that 60% of them have personalcomputers at home. Construct a 95% confidence interval estimate of the true proportion of all collegestudents who have personal computers at home.5. A politician engaged the services of a private opinion pollster to determine the sample size neededamong his constituents to interview about their perceptions on the freedom of information bill.Previous polls revealed that approximately 62.5% are in favor of the bill. The politicians adopted the95% level of confidence within an error of 2%. How large a sample does the pollster need?

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Answered: 1. Find pand 4: In a survey of 80…

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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A survey of entry level corporate analysts in New York City asked, approximately how many hours per week do you work? A) If the population standard deviation is known to be 4.7 hours, and a random sample of 35 analysts yielded a mean of 50.5 hours, then construct a 90% confidence interval for the mean number of hours worked by entry level analysts. B) In the above confidence interval, suppose that we want a margin of error of +/- 1 hour. What sample size would be needed to achieve this? C) As mentioned in class, it is unlikely that the population standard deviation is known. Suppose instead that the sample standard deviation was 4.7 hours. Using the other values from part (a), form a 90% confidence interval for the mean number of hours worked by entry level analysts.
2. The National Health Statistics Reports dated Oct. 22, 2008, included the following information on the heights (in.) for non-Hispanic white females: Age Sample Size Sample Mean Std. Error Mean 20-39 866 64.9 .09 60 and older 934 63.1 .11 a. Calculate and interpret a confidence interval at confidence level approximately 95% for the difference between population mean height for the younger women and that for the older women. (answer I found is (1.5214 , 2.0786)) b. Let denote the population mean height for those aged 20-39 and denote the population mean height for those aged 60 and older. Interpret the hypotheses and , and then carry out a test of these hypotheses at significance level .001 using the rejection region approach. (answer I found is = Reject the null hypothesis (p-value is less than the level of significance) c. What is the P-value for the test you carried out in (b)? Based on this P-value, would you reject the null hypothesis at any…
The figure to the right shows the results of a survey in which 1005 adults from Country A, 1023 adults from Country B, 995 adults from Country C, 1020 adults from Country D, and 1012 adults from Country E were asked whether national identity is strongly tied to birthplace. Country A37%22%27%49%Country BCountry CCountry DCountry E10% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. The 99% confidence interval for the proportion of adults from Country B who say national identity is strongly tied to birthplace is enter your response here ,enter your response here . (Round to three decimal places as needed.)
The figure to the right shows the results of a survey in which 1005 adults from Country A, 1023 adults from Country B, 995 adults from Country C, 1020 adults from Country D, and 1012 adults from Country E were asked whether national identity is strongly tied to birthplace. Country A37%22%27%49%Country BCountry CCountry DCountry E10% Construct a 99% confidence interval for the population proportion of adults who say national identity is strongly tied to birthplace for each country listed. Question content area bottom Part 1 The 99% confidence interval for the proportion of adults from Country A who say national identity is strongly tied to birthplace is (enter your response here ,enter your response here ). (Round to three decimal places as needed.)

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1. Find pand 4: In a survey of 80 children, 48 like to watch horror films. 110