Answered step by step
Verified Expert Solution
Link Copied!

Question

1 Approved Answer

A researcher wishes toestimate, with 99% confidence, the population proportion of adults who think Congress is doing a good or excellent job. Her estimate must

A researcher wishes toestimate, with 99% 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.

(b) Find the minimum sample sizeneeded, using a prior study that found that 22% 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 isavailable?

n=

nothing

(Round up to the nearest whole number asneeded.)

(b) What is 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 excellentjob?

n=

nothing

(Round up to the nearest whole number asneeded.)

(c) How do the results from (a) and (b)compare?

A.

Having an estimate of the population proportion raises the minimum sample size needed.

B.

Having an estimate of the population proportion has no effect on the minimum sample size needed.

C.

Having an estimate of the population proportion reduces the minimum sample size needed.

Step by Step Solution

There are 3 Steps involved in it

Step: 1

blur-text-image

Get Instant Access to Expert-Tailored Solutions

See step-by-step solutions with expert insights and AI powered tools for academic success

Step: 2

blur-text-image

Step: 3

blur-text-image

Ace Your Homework with AI

Get the answers you need in no time with our AI-driven, step-by-step assistance

Get Started

Recommended Textbook for

Finite Math And Applied Calculus

Authors: Stefan Waner, Steven Costenoble

6th Edition

1285415132, 9781285415130

More Books

Students also viewed these Mathematics questions

Question

5. Describe how contexts affect listening

Answered: 1 week ago