Question

a
national survey found that 46% of adults ages 25-29 had only a cell
phone and no landlines. Supposed that four 25-29 years olds are
randomly selected. What is the probability that at least one of
these adults has only a cell phone and no landline?

Answer #1

A national survey found that 56% of adults ages 25-29 had only
a cell phone and no landline. Suppose that three 25-29-year-olds
are randomly selected. Complete parts a through c below.
a) What is the probability that all of these adults have only a
cell phone and no landline? (Round to four decimal places as
needed.)
b) What is the probability that none of these adults have only a
cell phone and no landline? (Round to four decimal places as...

A survey of adults found that 56% of those who text on a cell
phone receive unwanted spam and messages. You randomly pick 100
adults who text on a cell phone. Find the probability that the
number of people who received spam and unwanted messages is exactly
60.

A survey of adults ages? 18-29 found that 93?% use the Internet.
You randomly select 132 adults ages? 18-29 and ask them if they use
the Internet.?
(a) Find the probability that exactly 125 people say they use
the Internet.?
(b) Find the probability that at least 125 people say they use
the Internet.?
(c) Find the probability that fewer than 125 people say they use
the Internet.
?(d) Are any of the probabilities in parts? (a)-(c) unusual?
Explain.

A survey of adults ages 18-29 found that 85% use the Internet.
You randomly select 157 adults ages 18-29 and ask them if they use
the Internet. (a) Find the probability that exactly 134 people say
they use the Internet. (b) Find the probability that at least 134
people say they use the Internet. (c) Find the probability that
fewer than 134 people say they use the Internet. (d) Are any of
the probabilities in parts (a)-(c) unusual? Explain. Use...

In a recent year, a study found that 77% of adults ages 18–29
had internet access at home. A researcher wanted to estimate the
proportion of undergraduate college students (18–29 years) with
access, so she randomly sampled 187 undergraduates and found that
165 had access. Estimate the true proportion with 99% confidence.
Round intermediate answers to five decimal places. Round your final
answer to one decimal place.

in
a survey of 3303 adults ages 57 through 85 years, it was found that
80.2% of them used at least one prescription medication. Complete
parts 1-3 below
1: how many of the 3303 subjects used at least one
prescription medication?
2: construct a 90% confidence interval estimate of the
percentage of adults ages 57 through 85 years who use at least one
prescription medication
3: what do the results tell us about the proportion of The
adults who use...

A recent survey found that 72% of all adults over 50 own cell
phones. You randomly select 43 adults over 50, and ask if he or she
owns a cell phone. Find the mean number of cell phones owned by a
sample of 43 adults over 50 years old. Round to two decimal
places

A survey of 25 randomly selected customers found the ages
shown (in years). The mean is 31.04 years and the standard
deviation is 9.00 years.
a) Construct a 99% confidence interval for the mean age of all
customers, assuming that the assumptions and conditions for the
confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be 9.0 years?

A survey of 25 randomly selected customers found the ages shown
(in years). The mean is 32.88 years and the standard deviation is
8.96 years.
a) Construct a 90% confidence interval for the mean age of
all customers, assuming that the assumptions and conditions for
the confidence interval have been met.
b) How large is the margin of error?
c) How would the confidence interval change if you had assumed
that the standard deviation was known to be 9.0 years?

According to a study, 78% of adults ages 18-29 years had
broadband internet access at home in 2011. A researcher wanted to
estimate the proportion of undergraduate college students 18-23)
with access, so she randomly sample 182 undergraduates and found
that 159 had access. Estimate the true proportion with 90%
confidence.

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