Question

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 parts (a) and (b).

Answer #1

A researcher wishes to estimate, with 90% 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 38% 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
9090%
confidence, the population proportion of adults who eat fast
food four to six times per week. Her estimate must be accurate
within
55%
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
2222%
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 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 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 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 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 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 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 90?% ?confidence, the
population proportion of adults who say chocolate is their favorite
ice cream flavor. 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 36?% of the
respondents said their favorite flavor of ice cream is chocolate.
?(c) Compare the results from parts? (a) and?...

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...

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