A research survey is commissioned to estimate the proportion of UK people who have traveled to France by taking Eurostar. The survey is told that the estimate must not differ from the true proportion by more than 3% with a confidence level of 95%. How large a sample should be taken? How about at 99% confidence?

A research survey is commissioned to estimate the proportion of UK people who have traveled to France by taking Eurostar. The survey is told that the estimate must not differ from the true proportion by more than 3% with a confidence level of 95%. How large a sample should be taken? How about at 99% confidence?

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...

See similar textbooks

Similar questions

Question Emilio wants to estimate the percentage of people who have a financial adviser. He surveys 350 individuals and finds that 76 have a financial adviser. Identify the values needed to calculate a confidence interval at the 99% confidence level. Then find the confidence interval. Z0.10 Z0.05 Z0.025 Z0.01 Z0.005 1.282 1.645 1.960 2.326 2.576 Use the table of common z-scores above. • Round the final answer to three decimal places. Provide your answer below: Next « Previous DII DD 80 F9 F10 F11 F12 F5 F7 F8 F3 F4
Translate the statement into a confidence interval. Approximate the level of confidence. In a survey of 1011 parents of children ages 8-14, 70% say they are willing to get a second or part-time job to pay for their children's college education and 42% say they lose sleep worrying about college costs. The survey's margin of error is +2%. Use the results from the survey about getting a second or part-time job. The confidence interval for the proportion is ( D (Round to three decimal places as needed.)
In a survey of 2312 adults, 748 say they believe in UFOS. Construct a 99% confidence interval for the population proportion of adults who believe in UFOS. A 99% confidence interval for the population proportion is ( ). (Round to three decimal places as needed.) Enter your answer in the edit fields and then click Check Answer. ? part 1 remaining Clear All Check Answer
A quality control specialist wants to estimate the percentage of defective batteries within 5% from the true value, at the 90% confidence level. How many batteries should be randomly sampled? Round your answer up to a whole number.
Use the sample data and confidence level given below. A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=979 and x=530 who said "yes." Use a 95% confidence level. Find the best point estimate of the population proportion p, q, p, q, e, n
In a survey of 2343 adults, 700 say they believe in UFOs. Construct a 90%confidence interval for the population proportion of adults who believe in UFOs. Part 1 A 90% confidence interval for the population proportion is ( __, __ ) Interpret your results. Choose the correct answer below. A. The endpoints of the given confidence interval shows that 90% of adults believe in UFOs. B. With 90% confidence, it can be said that the population proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. C. With 90% confidence, it can be said that the sample proportion of adults who believe in UFOs is between the endpoints of the given confidence interval. D. With 90% probability, the population proportion of adults who do not believe in UFOs is between the endpoints of the given confidence interval.
Type only the answers please. Do not handwritten.
Answer for no. 7 please :>
For the same sample statistics, which level of confidence would produce the widest confidence interval? Explain your reasoning. Choose the correct answer below. 99%, because as the level of confidence increases, ze decreases. 99%, because as the level of confidence increases, Z increases. O 90%, because as the level of confidence decreases, ze increases. 90%, because as the level of confidence decreases, Zc decreases.
how to solve?
Use the sample data and confidence level given below to complete parts (a) through (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll, n=1005 and x=534 who said "yes." Use a 99% confidence level. LOADING... Click the icon to view a table of z scores. Question content area bottom Part 1 a) Find the best point estimate of the population proportion p. enter your response here (Round to three decimal places as needed.) Part 2 b) Identify the value of the margin of error E. E=enter your response here (Round to three decimal places as needed.) Part 3 c) Construct the confidence interval. enter your response here<p<enter your response here (Round to three decimal places as needed.) Part 4 d) Write a statement that correctly interprets the confidence interval. Choose the correct answer below. A. One has 99% confidence that the interval from the lower bound to the upper bound…