A researcher wishes to​ estimate, with 95​% ​confidence, the population proportion of motor vehicle fatalities that were caused by​ alcohol-impaired driving. His estimate must be accurate within 3​%...


A researcher wishes to​ estimate, with
95​% ​confidence, the population proportion of motor vehicle fatalities that were caused by​ alcohol-impaired driving. His estimate must be accurate within 3​% of the population 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 motor vehicle fatalities that were caused by​ alcohol-impaired
driving.


​(c) Compare the results from parts ​(a) and ​(b).

A researcher wishes to estimate, with 95% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate<br>must be accurate within 3% of the population proportion.<br>(a) No preliminary estimate is available. Find the minimum sample size needed.<br>(b) Find the minimum sample size needed, using a prior study that found that 26% of motor vehicle fatalities that were caused by alcohol-impaired driving.<br>(c) Compare the results from parts (a) and (b).<br>(a) What is the minimum sample size needed assuming that no prior information is available?<br>n =<br>(Round up to the nearest whole number as needed.)<br>(b) What is the minimum sample size needed using a prior study that found that 26% of motor vehicle fatalities that were caused by alcohol-impaired driving?<br>(Round up to the nearest whole number as needed.)<br>n=<br>(c) How do the results from (a) and (b) compare?<br>A. Having an estimate of the population proportion reduces the minimum sample size needed.<br>B. Having an estimate of the population proportion raises the minimum sample size needed.<br>O C. Having an estimate of the population proportion has no effect on the minimum sample size needed.<br>

Extracted text: A researcher wishes to estimate, with 95% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be accurate within 3% of the population 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 motor vehicle fatalities that were caused by alcohol-impaired driving. (c) Compare the results from parts (a) and (b). (a) What is the minimum sample size needed assuming that no prior information is available? n = (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 motor vehicle fatalities that were caused by alcohol-impaired driving? (Round up to the nearest whole number as needed.) n= (c) How do the results from (a) and (b) compare? A. Having an estimate of the population proportion reduces the minimum sample size needed. B. Having an estimate of the population proportion raises the minimum sample size needed. O C. Having an estimate of the population proportion has no effect on the minimum sample size needed.
Jun 01, 2022
SOLUTION.PDF

Get Answer To This Question

Related Questions & Answers

More Questions »

Submit New Assignment

Copy and Paste Your Assignment Here