Question

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? (b).

Answer #1

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 2?% 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 18?% 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
99%
confidence, the population proportion of adults who say
chocolate is their favorite ice cream flavor. Her estimate must be
accurate within
2%
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
18%
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
ninety percent*
confidence, the population proportion of adults who say
chocolate is their favorite ice cream flavor. Her estimate must be
accurate within
twenty two percent*
of the population proportion.
Now:
(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
twenty percent
of the respondents said their favorite flavor of ice cream is
chocolate.
(c) Compare the...

A researcher wishes to estimate, with 90% 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 4% of the true proportion. No preliminary estimate
is available. Find the minimum sample size needed. Find the minimum
sample size needed, using a prior study that found that 28% of the
respondents said they think their president can control the price
of gasoline. Compare the results. What...

A researcher wishes to estimate, with 90% confidence, the
population proportion of adults who think Congress is doing a good
or excellent job. Her estimate must be accurate within 1% 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 40% 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 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 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 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 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 90% confidence, the
population proportion of adults who think Congress is doing a good
or excellent job. Her estimate must be accurate within 22% 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 26% of the respondents said they think Congress is
doing a good or excellent job.
(c) Compare the results from...

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