Question
18. A researcher wishes to be 95% confident that her estimate of the true proportion of...
18. A researcher wishes to be 95% confident that her estimate of the true proportion of individuals who travel overseas is within 3% of the true proportion.
a) Find the sample necessary if, in a prior study, a sample of 200 people showed that 40 traveled overseas last year. b)
b) If no estimate of the sample proportion is available, how large should the sample be?
Homework Answers
Answer #1
Not the answer you're looking for?
Similar Questions
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who are confident...
A researcher wishes to estimate, with 95% confidence, the
population proportion of adults who are confident with their
country's banking system. His estimate must be accurate within 4%
of the population proportion. (a) No preliminary estimate is
available. Find the minimum sample size needed. (b) Find the
minimum sample size needed, using a prior study that found that
28% of the respondents said they are confident with their
country's banking system. (c) Compare the results from parts (a)
and (b).
A researcher wishes to? estimate, with 95?% ?confidence, the population proportion of adults who are confident...
A researcher wishes to? estimate, with 95?% ?confidence, the
population proportion of adults who are confident with their?
country's banking system. His estimate must be accurate within 3?%
of the population proportion. ?(a) No preliminary estimate is
available. Find the minimum sample size needed. ?(b) Find the
minimum sample size? needed, using a prior study that found that
22?% of the respondents said they are confident with their?
country's banking system. ?(c) Compare the results from parts ?(a)
and ?(b)....
A researcher wishes to estimate, with 99% confidence, the population proportion of adults who are confident...
A researcher wishes to estimate, with 99% confidence, the
population proportion of adults who are confident with their
country's banking system. His estimate must be accurate within 3%
of the population proportion. (a) No preliminary estimate is
available. Find the minimum sample size needed. (b) Find the
minimum sample size needed, using a prior study that found that
26% of the respondents said they are confident with their
country's banking system. (c) Compare the results from parts (a)
and (b).
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think the...
A researcher wishes to estimate, with 95%
confidence, the population proportion of adults who think the
president of their country can control the price of gasoline. Her
estimate must be accurate within 5% of the true proportion.
a) No preliminary estimate is available. Find the minimum
sample size needed.
b) Find the minimum sample size needed, using a prior study
that found that
22%
of the respondents said they think their president can control
the price of gasoline.
c) Compare...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who think Congress...
A researcher wishes to estimate, with 95% confidence, the
population proportion of adults who think Congress is doing a good
or excellent job. Her estimate must be accurate within 3% of the
true proportion.
(a) No preliminary estimate is available. Find the minimum
sample size needed.
(b) Find the minimum sample size needed, using a prior study
that found that 36% of the respondents said they think Congress is
doing a good or excellent job.
(c) Compare the results from...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who support labeling...
A researcher wishes to estimate, with 95% confidence, the
population proportion of adults who support labeling legislation
for genetically modified organisms (GMOs). Her estimate must be
accurate within 5% of the true proportion. (a) No preliminary
estimate is available. Find the minimum sample size needed. (b)
Find the minimum sample size needed, using a prior study that
found that 66% of the respondents said they support labeling
legislation for GMOs. (c) Compare the results from parts (a) and
(b). (a)...
A researcher wishes to estimate, with 95% confidence, the population proportion of adults who eat fast...
A researcher wishes to estimate, with 95% confidence, the
population proportion of adults who eat fast food four to six times
per week. Her estimate must be accurate within 5% of the
population proportion.
(a) No preliminary estimate is available. Find the minimum
sample size needed.
(b) Find the minimum sample size needed, using a prior study
that found that 20% of the respondents said they eat fast food
four to six times per week.
(c) Compare the results from...
A researcher wishes to estimate, with 95% confidence, the population of adults who think Congress is...
A researcher wishes to estimate, with 95% confidence, the
population of adults who think Congress is doing a good or
excellent job. Her estimate must be accurate within 4% of the true
proportion.
(a) No preliminary estimate is available. Find the minimum
sample size needed.
(b) Find the minimum sample size needed, using a prior study
that found that 44% of the respondents said they think Congress is
doing a good or excellent job.
(c) Compare the results from parts...
A medical researcher wishes to determine the percentage of females who take vitamins. He wishes to...
A medical researcher wishes to determine the percentage of
females who take vitamins. He wishes to be 99% confident that the
estimate is within 2 percentage points of the true proportion. a)
If no estimate of the sample proportion is available, how large
should the sample be?
b) A recent study showed that 25% of females take vitamins.
Given this additional information, how large a sample size would be
needed?
c) Compare the results in a) and b) and comment...
A medical researcher wishes to determine the percentage of females who take vitamins. He wishes to...
A medical researcher wishes to determine the percentage of
females who take vitamins. He wishes to be 95% confident that the
estimate is within 5 percentage points of the true proportion. A
recent study of 320 females showed that 45% took vitamins. How
large should the sample size be?
380
381
9
10
ADVERTISEMENT
Need Online Homework Help?
Get Answers For Free
Most questions answered within 1 hours.
ADVERTISEMENT
Active Questions
asked 22 minutes ago
asked 51 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