Question

**Elderly drivers.** A polling agency interviews
866 American adults and finds that 546 think licensed drivers
should be required to retake their road test once they reach 65
years of age. Round all answers to 4 decimal places.

1. Calculate the point estimate for the proportion of American adults that think licensed drivers should be required to retake their road test once they reach 65 years of age.

2. Calculate the standard error for the point estimate you calculated in part 1.

3. Calculate the margin of error for a 95% confidence interval for the proportion of American adults that think licensed drivers should be required to retake their road test once they reach 65 years of age.

4. What are the lower and upper limits for the 95% confidence interval.

( , )

5. Based on a 95% confidence interval, does the poll provide
convincing evidence that *more* than 70% of the population
think that licensed drivers should be required to retake their road
test once they turn 65?

**A.** No, because our confidence interval includes
70%.

**B.** Yes, because a wider confidence interval would
include 70%.

**C.** No, because the plausible values for this
percentage are all less than 70%.

**D.** Yes, because 70% is more than the values in our
confidence interval.

6. Use the information from the polling agency to determine the sample size needed to construct a 90% confidence interval with a margin of error of no more than 4.1%. For consistency, use the reported sample proportion for the planning value of p* (rounded to 4 decimal places) and round your Z-value to 3 decimal places. Your answer should be an integer.

Answer #1

1) point estimate for the proportion =0.6305

2) standard error for the point estimate =0.0164

3) margin of error =0.0321

4) lower and upper limits for the 95% confidence interval =0.5984 ; 0.6626

5)

**C.** No, because the plausible values for this
percentage are all less than 70%.

6)

here margin of error E = | 0.041 | |

for90% CI crtiical Z = | 1.645 | |

estimated proportion=p= | 0.6305 | |

required sample size n = |
p*(1-p)*(z/E)^{2}= |
376.00 |

(1 point) In January, 2011, The Marist Poll published a report
stating that 66% of adults nationally think licensed drivers should
be required to retake their road test once they reach 65 years of
age. It was also reported that interviews were conducted on 1,1018
American adults, and that the margin of error was 3% using a 95%
confidence level. Based on this information, choose the correct
statements below.
(a) Verify the margin of error reported by The Marist Poll...

In a survey of 1018 adults, a polling agency asked, "When you
retire, do you think you will have enough money to live comfortably
or not. Of the 1018 surveyed,
537 stated that they were worried about having enough money to
live comfortably in retirement. Construct a 95% confidence interval
for the proportion of adults who are worried about having enough
money to live comfortably in retirement.
Select the correct choice below and fill in the answer boxes to
complete...

In a survey of 1019 adults, a polling agency asked, "When you
retire, do you think you will have enough money to live comfortably
or not. Of the 1019 surveyed, 535 stated that they were worried
about having enough money to live comfortably in retirement.
Construct a 99% confidence interval for the proportion of adults
who are worried about having enough money to live comfortably in
retirement. A. There is 99% confidence that the true proportion of
worried adults is...

In a survey of
1001
adults, a polling agency asked, "When you retire, do you
think you will have enough money to live comfortably or not. Of
the
10011
surveyed,
522
stated that they were worried about having enough money to live
comfortably in retirement. Construct a
9090%
confidence interval for the proportion of adults who are worried
about having enough money to live comfortably in retirement.

In a survey of 1008 adults, a polling agency asked, "When you
retire, do you think you will have enough money to live comfortably
or not. Of the1008 surveyed, 526 stated that they were worried
about having enough money to live comfortably in retirement.
Construct a 90%confidence interval for the proportion of adults
who are worried about having enough money to live comfortably in
retirement.

In a survey of 1020 adults, a polling agency asked, "When you
retire, do you think you will have enough money to live comfortably
or not. Of the 1020 surveyed, 538 stated that they were worried
about having enough money to live comfortably in retirement.
Construct a 99% confidence interval for the proportion of adults
who are worried about having enough money to live comfortably in
retirement.

In a survey of 1020 adults, a polling agency asked"When you retire,
do you think you will have enough money to live comfortably or not
the 1020 surveyed, 539 stated that they were worried about having
enough money to live comfortably in retirement. Construct a 99%
confidence interval for the proportion of adults who are worried
about having enough money to live confortably in
retirement.

A polling organization interviewed by phone 400 randomly
selected adults in New York City about their opinion on random drug
testing for taxi drivers and found that 38% favored such a
regulation.
Find the standard error of the proportion.
Find and interpret the 95% confidence interval for the
population proportion.
Find and interpret the 99% confidence interval for the
population proportion..

In a survey of 1016 adults, a polling agency asked, "When
youretire, do you think you will have enough money to live
comfortably or not. Of the 1016 surveyed, 532 stated that they
were worried about having enough money to live comfortably in
retirement. Construct a 90% confidence interval for the proportion
of adults who are worried about having enough money to live
comfortably in retirement. Select the correct choice below and fill
in the answer boxes to complete your...

In a survey of 10101010 adults, a polling agency asked, "When
you retire, do you think you will have enough money to live
comfortably or not. Of the 10101010 surveyed, 532532 stated that
they were worried about having enough money to live comfortably in
retirement. Construct a 9090% confidence interval for the
proportion of adults who are worried about having enough money to
live comfortably in retirement. Click here to view the standard
normal distribution table (page 1). LOADING... Click...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 32 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago