Question

Pew Internet and American Life Project asked an SRS of 2285 cell phone users whether they had used their cell phone to look up health or medical information. Of these, 462 said “Yes.” Calculate a 99% confidence interval to estimate the proportion of all cell phone users who have used their cell phone to look up health or medical information. What is the upper bound of your confidence interval?

(Give at least two decimal places.)

Answer #1

A Pew Internet poll asked cell phone owners about how they used
their cell phones. One question asked whether or not during the
past 30 days they had used their phone while in a store to call a
friend or family member for advice about a purchase they were
considering. The poll surveyed 1003 adults living in the United
States by telephone. Of these, 462 responded that they had used
their cell phone while in a store within the last...

The Pew Internet and American Life Project reported on the
widespread use of the Internet to search for information regarding
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year.
With 96 % confidence, we estimate between %
and % of adult Internet users had searched for
information on experimental treatments or medicines in the past
year. (After converting to percentages, round...

One of the questions in the Pew Internet & American Life
Project asked adults if they used the Internet at least
occasionally. The results showed that 454 out of 478 adults aged
18–29 answered Yes; 741 out of 833 adults aged 30–49 answered Yes;
and 1,058 out of 1,644 adults aged 50 and over answered Yes.
If required, round your answers to four decimal places.
(a)
Develop a point estimate of the proportion of adults aged 18–29
who use the...

1) The Pew Research Center Internet Project conducted a survey
of 907 Internet users. This survey provided a variety of statistics
on them. If required, round your answers to four decimal places.
(a) The sample survey showed that 90% of respondents said the
Internet has been a good thing for them personally. Develop a 95%
confidence interval for the proportion of respondents who say the
Internet has been a good thing for them personally. to (b) The
sample survey showed...

The Pew Research Center Internet Project conducted a survey of
957 Internet users. This survey provided a variety of statistics on
them.
If required, round your answers to four decimal places.
(a)
The sample survey showed that 90% of respondents said the
Internet has been a good thing for them personally. Develop a 95%
confidence interval for the proportion of respondents who say the
Internet has been a good thing for them personally.
____to____
(b)
The sample survey showed that...

The Pew Research Center Internet Project conducted a survey of
857 Internet users. This survey provided a variety of statistics on
them.
If required, round your answers to four decimal places.
(a)
The sample survey showed that 90% of respondents said the
Internet has been a good thing for them personally. Develop a 95%
confidence interval for the proportion of respondents who say the
Internet has been a good thing for them personally.
to
(b)
The sample survey showed that...

The Pew Research Centers Internet and American Life project
surgery of 2,252 American Adults, ages 18 years and older,
conducted January 20, 2012 - February 19, 2011, revealed that 46%
of American adults own a smartphone of some kind
A) Perform the two (2) checks necessary for determining the
confidence interval for the proportion go American adults who own a
smartphone. For each check, clearly state the conclusion using 1
sentence. You must use appropriate notation.
B) Determine and state...

In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2662
subjects randomly selected from an online group involved with
ears. 1018 surveys were returned. Construct a
99% confidence interval for the proportion of returned
surveys.
a) Find the best point estimate of the population proportion
p.
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
(Round to three decimal places as needed.)
c) Construct...

In a survey on downloading music, a poll asked 724 internet
users if they "ever downloaded music from an internet site that was
not authorized by a recording company, or not" and 16% responded
"yes". Construct a 99% confidence interval for the true proportion
of internet users who have downloaded music from an internet site
that was not authorized.
What is the confidence interval?

In a study of cell phone use and brain hemispheric dominance,
an Internet survey was e-mailed to 2353 subjects randomly selected
from an online group involved with ears. 965 surveys were returned.
Construct a 95% confidence interval for the proportion of returned
surveys.
a) Find the best point estimate of the population proportion
p.
________?
(Round to three decimal places as needed.)
b) Identify the value of the margin of error E.
E=______?
(Round to three decimal places as needed.)...

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