KA researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress isdoing 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.(b) Find the minimum sample size needed, using a prior study that found that 26% of the respondents said they thinkCongress 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 26% of the respondents said theythink Congress is doing a good or excellent job?n= (Round up to the nearest whole number as needed.)(c) How do the results from (a) and (b) compare?n=O A. Having an estimate of the population proportion has no effect on the minimum sample size needed.B.Having an estimate of the population proportion raises the minimum sample size needed.OC. Having an estimate of the population proportion reduces the minimum sample size needed.

A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think…

Answered: (a) No preliminary estimate is…

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 recent survey by the Indiana State University Department of Athletics aims to evaluate the popularity of its mascot, Sycamore Sam within its community. The department interviews 250 randomly selected individuals in the community of 13000, and finds that 175 are fond of the "woodland creature" mascot. Based on the information given, can we assume the sample distribution of sample proportions will follow a Normal model? Answer by listing, and evaluating, the 4 conditions necessary using complete sentences.
(6) A student surveys some students on campus in the evening and finds that 16 out of 20 of the students she interviewed are part time students. She uses the data to estimate the percentage of all students who are part time. What type of bias is present in her sample?
The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
A company has been rating television programs for more than 60 years. It uses several sampling procedures, but its main one is to track the viewing patterns of 20,000 households. These contain more than 45,000 people and are chosen to form a cross-section of the overall population. The households represent various locations, ethnic groups, and income brackets. The data gathered from the sample of 20,000 households are used to draw inferences about the population of all households in the United States. Complete parts (a) and (b) below. What strata are used in the sample? Choose the correct answer below. A. The various locations, ethnic groups, and income brackets that are represented B. The various sampling procedures and viewing patterns C. The number of households and people that are chosen D. The television ratings Why is it important to have a stratified sample for these ratings? Choose the correct answer below. A. Stratified…
What is the Optimal Sample Size?
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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.
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(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 26% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b).