Extra PraWorksheee sA researcher wishes to estimate, with 99% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must beaccurate within 4% of the true proportion.(a) No preliminary estimate is available. Find the minimum sample size needed.(b) Find the minimum sample size needed, using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job.Tables (foee sAssignme (c) Compare the results from parts (a) and (b).(a) What is the minimum sample size needed assuming that no prior information is available?Gradeboce scn=(Round up to the nearest whole number as needed.)Email(b) What is the minimum sample size needed using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job?(Round up to the nearest whole number as needed.)eТеxtn=Accessibl (c) How do the results from (a) and (b) compare?ResourceO A. Having an estimate of the population proportion has no effect on the minimum sample size needed.Tools forO B. Having an estimate of the population proportion raises the minimum sample size needed.Multimed OC. Having an estimate of the population proportion reduces the minimum sample size needed.Click to select your answer(s).etv AMacBook Air&%23356フ8WERYUHKDFA -Ncommandoptionoptioncommand

As per the question we have Significance level α = 1 - 0.99 = 0.01 Error = 4% = 0.04

A researcher wishes to estimate, with 99 % confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job? (Round up to the nearest whole number as needed.) sibl (c) How do the results from (a) and (b) compare? arce A. Having an estimate of the population proportion has no effect on the minimum sample size needed. for B. Having an estimate of the population proportion raises the minimum sample size needed. imed OC. Having an estimate of the population proportion reduces the minimum sample size needed.

A researcher wishes to estimate, with 99 % confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? (Round up to the nearest whole number as needed.) (b) What is the minimum sample size needed using a prior study that found that 42% of the respondents said they think Congress is doing a good or excellent job? (Round up to the nearest whole number as needed.) sibl (c) How do the results from (a) and (b) compare? arce A. Having an estimate of the population proportion has no effect on the minimum sample size needed. for B. Having an estimate of the population proportion raises the minimum sample size needed. imed OC. Having an estimate of the population proportion reduces the minimum sample size needed.

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

A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 90% confident that his estimate is in error by no more than five percentage points? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of computers with new operating systems. n=0 (Round up to the nearest integer.) b) Assume that a recent survey suggests that about 95% of computers use a new operating system. n=0 (Round up to the nearest integer.) c) Does the additional survey information from part (b) have much of an effect on the sample size that is required? O A. No, using the additional survey information from part (b) does not change the sample size. O B. No, using the additional survey information from part (b) only slightly increases the sample size. OC. Yes, using the additional survey information from…
A researcher wishes to estimate, with 90% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 2% of the true proportion. (A) No preliminary estimate is available. Find the minimum sample size needed. (Round up to the nearest whole number asneeded.)
Determine the sample size needed to be 99% confident the population proportion estimate is within 3% of the true proportion. There is no prior information regarding values for p and q.
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must be accurate within 4% of the true proportion. (a) No preliminary estimate is available. Find the minimum sample size needed. (b) Find the minimum sample size needed, using a prior study that found that 22% of the respondents said they think Congress is doing a good or excellent job.
You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. a) How many households would you need to sample to be within 2 percent of the proportion of all households in Chicago that have two or more vehicles at a 90% level of confidence. b) You conduct a small preliminary sample, and you obtain a sample proportion of 19.5% that have two or more cars. Using this new information, what sample size should you gather in order to be within 2 percent of the proportion of all households in Chicago that have two or more vehicles at a 90% level of confidence.
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. (Round up to the nearest integer.)
A programmer plans to develop a new software system. In planning for the operating system that he will use, he needs to estimate the percentage of computers that use a new operating system. How many computers must be surveyed in order to be 99% confident that his estimate is in error by no more than four percentage points? Complete parts (a) through (c) below. a) Assume that nothing is known about the percentage of computers with new operating systems. n= (Round up to the nearest integer.)
You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. a) How many households would you need to sample to be within 1.5 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence. b) You conduct a small preliminary sample, and you obtain a sample proportion of 20% that have two or more cars. Using this new information, what sample size should you gather in order to be within 1.5 percent of the proportion of all households in Chicago that have two or more vehicles at a 95% level of confidence.