Question

6.3.17

A researcher wishes to estimate, with

9090%

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

55%

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

4646%

of the respondents said they think their president can control the price of gasoline.

c) Compare the results from parts (a) and (b).

(a) What is the minimum sample size needed assuming that no prior information is available?

nequals=nothing

(Round up to the nearest whole number as needed.)

Answer #1

A researcher wishes to estimate, with 99% 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 2% 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 38% of the respondents said they think their
president can control the price of gasoline.
c) Compare...

A researcher wishes to estimate, with 99% 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 2% 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 32% 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 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 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 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 28?% of the respondents said they think their president
can control the price of gasoline. ?c) Compare...

A researcher wishes to estimate, with 99 % 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. 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 think their president
can control the price of...

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 99% 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) What is the minimum sample size needed assuming that no prior
information is available? (round to nearest whole #)
b) What is the minimum sample size needed using a prior study
that found that 32% of the respondents said they think their...

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 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...

A
researcher wishes to estimate, with
9595%
confidence, the
population proportion of adults who think Congress is doing a good
or excellent job. Her estimate must be accurate within
33%
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
4040%
of
the respondents said they think Congress is doing a good or
excellent job.
(c) Compare the results
from...

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