Question

1. A poll found that out of 600 people polled, 72% of them owned and regularly used data on their smartphone.

a. Determine a 99% CI.

b. Determine the margin of error for the CI in part (a). Round to three decimal places. c. For a 99% CI and a margin of error of 0.01, determine the necessary sample size for estimating ?.

Answer #1

A poll was conducted to find out the percentage of people who
will support a state bill in Massachusetts. How large the sample
size n need to be polled to make sure the 95% confidence interval
has a margin of error of at most 2.6%.

1. A poll of 2234 U.S. adults found that 31% regularly used
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Find the margin of error and confidence interval for the
percentage of U.S. adults who regularly use Facebook as a news
source, at the 90% level of confidence. Round
all answers to 2 decimal places.
Margin of Error (as a percentage):
Confidence Interval: % to %
Find the margin of error and confidence interval for the
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A research poll showed that 1281 out of 2019 randomly polled
people in a country favor the death penalty for this convicted of
murder. Assuming the conditions for the CLT were met, complete
parts (a) and (b) below. Sample X N Sample p 95% CI 1 1281 2019
0.634473 (0.613466, 0.655479) a. Using the technology output
given, write out the following sentence. I am 95% confident that
the population proportion favoring the death penalty is between
nothing and nothing. (Round...

A poll of 2752 U.S. adults found that 90% regularly used
Facebook as a news source.
Find the margin of error and confidence interval for the
percentage of U.S. adults who regularly use Facebook as a news
source, at the 90% level of confidence. Round
all answers to 2 decimal places.
Margin of Error (as a percentage):
Confidence Interval: % to %
Find the margin of error and confidence interval for the
percentage of U.S. adults who regularly use Facebook...

a.For a confidence level of 96%, find the critical value
b.In a recent poll, 170 people were asked if they liked dogs,
and 56% said they did. Find the margin of error of this poll, at
the 95% confidence level.
Give your answer to three decimals
c.Out of 200 people sampled, 32 had kids. Based on this,
construct a 99% confidence interval for the true population
proportion of people with kids.
Give your answers as decimals, to three places
______<...

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.

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 99%
confidence level, what size of sample is needed?
Give your answer in whole people.

A
95%
confidence interval of
16.6
months to
49.6
months has been found for the mean duration of
imprisonment,
muμ,
of political prisoners of a certain country with chronic
PTSD.
a. Determine the margin of error, E.
b. Explain the meaning of E in this context in terms of the
accuracy of the estimate.
c. Find the sample size required to have a margin of error
of
12
months and a
99%
confidence level. (Use
sigmaσequals=42
months.)d. Find a
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People were polled on how many books they read the previous
year. Initial survey results indicate that
sequals=10.6
books. Complete parts (a) through (d) below.
LOADING...
Click the icon to view a partial table of critical values.(a)
How many subjects are needed to estimate the mean number of books
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four
books with
90%
confidence?This
90 %
confidence level requires
nothing
subjects. (Round up to the nearest subject.)(b) How many
subjects are needed to estimate the...

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

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