Question

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.

If the candidate only wants a 9% margin of error at a 95%
confidence level, what size of sample is needed?

Give your answer in whole people.

Answer #1

Solution :

Given that,

= 0.5

1 - = 0.5

margin of error = E = 9% = 0.09

At 95% confidence level the z is ,

= 1 - 95% = 1 - 0.95 = 0.05

/ 2 = 0.05 / 2 = 0.025

Z/2 = Z0.025= 1.96 ( Using z table )

Sample size = n = (Z/2 / E)2 * * (1 - )

= (1.96 / 0.09)2 * 0.5 * 0.5

= 118.5679

Sample size =119

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 5% margin of error at a 95%
confidence level, what size of sample is needed?
Give your answer in whole people.

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 3% margin of error at a 95%
confidence level, what size of sample is needed?
Give your answer in whole people.

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 10% margin of error at a 90%
confidence level, what size of sample is needed?
Give your answer in whole people

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 8% margin of error at a 99%
confidence level, what size of sample is needed?
Give your answer in whole people.

4. A political candidate has asked you to conduct a poll to
determine what percentage of people support her. If the candidate
only wants a 2% margin of error at a 90% confidence level, what
size of sample is needed? Give your answer in whole people.

A political candidate has asked you to conduct a poll to
determine what percentage of people support him. If the candidate
only wants a 0.5% margin of error at a 95% confidence level, what
size of sample is needed?

A political candidate has asked you to conduct a poll to
determine what percentage of people support her. If the candidate
only wants a 0.1% margin of error at a 99.5% confidence level, what
size of sample is needed? ______

A political candidate has asked you to conduct a poll to
determine what percentage of people support her.
If the candidate only wants a 7% margin of error at a 90%
confidence level, what size of sample is needed?

A political candidate has asked you to conduct a poll to
determine what percentage of people support him. If the candidate
only wants a 4% margin of error at a 97.5% confidence level, what
size of sample is needed? When finding the z-value, round it to
four decimal places.
You want to obtain a sample to estimate a population proportion.
At this point in time, you have no reasonable preliminary
estimation for the population proportion. You would like to be...

A political candidate has asked his/her assistant to conduct a
poll to determine the percentage of people in the community that
supports him/her. If the candidate wants a 1% margin of error at a
99% confidence level, what size of sample is needed? Be
sure to round accordingly.
The candidate would need to survey ?????? people in the community
in order to be within a 1% margin of error at a 99% confidence
level.

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 1 minute ago

asked 7 minutes ago

asked 10 minutes ago

asked 20 minutes ago

asked 20 minutes ago

asked 21 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 27 minutes ago

asked 28 minutes ago

asked 30 minutes ago