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 5% 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 20% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b). 11. (a) What is the minimum sample size needed assuming that no prior information is available? =(Round up to the nearest whole number as needed.) n=
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 5% 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 20% of the respondents said they think Congress is doing a good or excellent job. (c) Compare the results from parts (a) and (b). 11. (a) What is the minimum sample size needed assuming that no prior information is available? =(Round up to the nearest whole number as needed.) n=
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 5E
Related questions
Question
![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 5% 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 20% 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.)
A](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F251ecf8c-f60f-42ba-a7d7-d6caf946f58f%2F13ddc781-b572-484d-bc69-afdf4c44a06c%2Fs9qitwj_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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 5% 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 20% 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.)
A
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