A researcher collected a random sample of responses to a survey of university students. The researcher noted that 30% of respondents favoured classes on Fridays. a. The width of a 95% confidence interval estimate for the population proportion of students in favour of Friday classes is 0.1211. Find the sample size n. (Round the answer to the closest integer as n must be a whole number.) b. Based on your findings in part a, calculate a 99% confidence interval estimate for the population proportion of students in favour of Friday classes.

A researcher collected a random sample of responses to a survey of university students. The researcher noted that 30% of respondents favoured classes on Fridays. a. The width of a 95% confidence interval estimate for the population proportion of students in favour of Friday classes is 0.1211. Find the sample size n. (Round the answer to the closest integer as n must be a whole number.) b. Based on your findings in part a, calculate a 99% confidence interval estimate for the population proportion of students in favour of Friday classes.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

In a survey of 2263 adults, 702 say they believe in UFOs. Construct a 95% confidence interval for the population proportion of adults who believe in UFOs. A 95% confidence interval for the population proportion is () (Round to three decimal places as needed.) Interpret your results. Choose the correct answer below. O A. With 95% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. O B. The endpoints of the given confidence interval shows that 95% of adults believe in UFOs. OC. With 95% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval. O D. With 95% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval.
The FBI wants to determine the effectiveness of their 1010 Most Wanted list. To do so, they need to find out the fraction of people who appear on the list that are actually caught. Step 2 of 2 : Suppose a sample of 283283 suspected criminals is drawn. Of these people, 9393 were captured. Using the data, construct the 85%85% confidence interval for the population proportion of people who are captured after appearing on the 1010 Most Wanted list. Round your answers to three decimal places.
Tina catches a 14-pound bass. She does not know the population mean or standard deviation. So she takes a sample of five friends and they say the last bass they caught was 9, 12, 13, 10, and 10 pounds. Find the t and calculate a 95% (α = .05) confidence interval.
Need help with this question. Thank you :)
An economist needs to estimate the proportion of residents of Sebastian that have earned a college degree. Determine the most conservative estimate of the sample size required to limit the margin of error to within 0.025 of the population proportion for a 96% confidence interval.Round the solution up to the nearest whole number.n=
A statistics instructor randomly selected four bags of oranges, each bag labeled 10 pounds, and weighed the bags. They weighed 10.3, 10.8, 10.4, and 10.6 pounds. Assume that the distribution of weights is Normal. Find a 95% confidence interval for the mean weight of all bags of oranges. Use technology for your calculations. Answer parts a and b below. a. Choose the correct interpretation of the confidence interval below and, if necessary, fill in the answer boxes to complete your choice. A. We are 95% confident the population mean is between and B. There is a 95% chance that all intervals will be between and C. We are 95% confident that the sample mean is between and D. The requirements for constructing a confidence interval are not satisfied. (Type integers or decimals rounded to the nearest thousandth as needed. Use ascending order.)
Answer question 12 and show all the steps.
Solve question #6 both part a and part b please and thank you.
The owner of the west end Kwick fill gas station wishes to determine the proportion of customers who pay at the pump using credit card or debit card. He surveys 100 customers and finds that 85 pay at the pump. (Round your answers to 3 decimal places.) a. Estimate the value of the population proportion: b. Develop a 95% confidence interval for the population proportion.
The FBI wants to determine the effectiveness of their 10 Most Wanted list. To do so, they need to find out the fraction of people who appear on the list that are actually caught. Step 2 of 2: Suppose a sample of 871 suspected criminals is drawn. Of these people, 243 were captured. Using the data, construct the 99%confidence interval for the population proportion of people who are captured after appearing on the 10 Most Wanted list. Round your answers to three decimal places.
In a sample of 100 college students, 25 of them own a car. Calculate the 95% confidence interval for the true population of college students who own a car. Choose the closest one. A. (0.165132, 0.334868) B. (0.231725, 0.452302) C. (0.25, 0.75) D. (0.1, 0.9)
You are interested in constructing a 99% confidence interval for the proportion of all caterpillars that eventually become butterflies. Of the 418 randomly selected caterpillars observed, 59 lived to become butterflies. Round answers to 4 decimal places where possible. a. With 99% confidence the proportion of all caterpillars that lived to become a butterfly is between and . b. If many groups of 418 randomly selected caterpillars were observed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population proportion of caterpillars that become butterflies and about percent will not contain the true population proportion.