Question

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 parts (a) and (b).

Answer #1

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
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...

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 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 90% 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 42%
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 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 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 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 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...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 7 minutes ago

asked 10 minutes ago

asked 19 minutes ago

asked 22 minutes ago

asked 33 minutes ago

asked 41 minutes ago

asked 56 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago