Question

In a simple random sample of 1180 U.S. adults from a large population, it is found that 816 “regularly” spend more than 40 minutes per day checking email. Use this sample to estimate the true percentage, p, of all U.S. adults in this population who “regularly” spend more than 40 minutes per day checking email.In each question below, give answers as percents, rounded to at least two decimal places.

(a) Find a 95% confidence interval for p

% < p < %

(b) Find a 90% confidence interval for p

% < p < %

(c) Find a 99% confidence interval for p

% < p < %

Answer #1

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
percentage of U.S. adults who regularly use...

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...

in a simple random sample of 50 people. it was found
that the sample mean time they spend on social media each day was
42 minutes .suppose it is know that the population standard
deviation is 8 minutes. construct a 90% confidence interval of the
population mean time spent on social media each day

Pinworm: In a random sample of 810 adults in
the U.S.A., it was found that 84 of those had a pinworm
infestation. You want to find the 99% confidence interval for the
proportion of all U.S. adults with pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) Construct the 99% confidence interval for the proportion of all
U.S. adults with pinworm. Round your answers to...

Pinworm: In a random sample of 790 adults in the U.S.A., it
was found that 76 of those had a pinworm infestation. You want to
find the 99% confidence interval for the proportion of all U.S.
adults with pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal places.
(b) What is the critical value of z (denoted zα/2) for a 99%
confidence interval? Use the value...

In a random sample of 830 adults in the U.S.A., it was found
that 84 of those had a pinworm infestation. You want to find the
95% confidence interval for the proportion of all U.S. adults with
pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) Construct the 95% confidence interval for the proportion of all
U.S. adults with pinworm. Round your answers to 3...

In a random sample of 830 adults in the U.S.A., it was found
that 84 of those had a pinworm infestation. You want to find the
95% confidence interval for the proportion of all U.S. adults with
pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) What is the critical value of z (denoted
zα/2) for a 95% confidence interval?
Use the value from the...

Pinworm: In a random sample of 790 adults in
the U.S.A., it was found that 80 of those had a pinworm
infestation. You want to find the 95% confidence interval for the
proportion of all U.S. adults with pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal
places.
(b) What is the critical value of z (denoted
zα/2) for a 95% confidence interval?
Use the value from...

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found that 76 of those had a pinworm infestation. You want to find
the 95% confidence interval for the proportion of all U.S. adults
with pinworm.
(a) What is the point estimate for the proportion of all U.S.
adults with pinworm? Round your answer to 3 decimal places.
(b) What is the critical value of z (denoted zα/2) for a 95%
confidence interval? Use the value from...

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(a) Find the point estimate for the population proportion p of
U.S. adults who think that there should be more government
regulation of oil companies.
(b) Construct a 95% confidence interval for the population
proportion. Interpret the results.
(c) Find the minimum sample size needed to estimate the
population proportion at the 99% confidence level in...

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