Question

How's the economy? A pollster wants to construct a 95 % confidence interval for the proportion of adults who believe that economic conditions are getting better.

(a) A poll taken in July 2010 estimates this proportion to be 0.41 . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02 ?

(b) Estimate the sample size needed if no estimate of p is available. Part 1 of 2

(a) A poll taken in July 2010 estimates this proportion to be 0.41 . Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.02 ?

A sample of adults is needed to obtain a 95 % confidence interval with a margin of error of 0.02 . Part 2 of 2

(b) Estimate the sample size needed if no estimate of p is
available.

A sample of adults is needed to obtain a 95 % confidence interval
with a margin of error of 0.02

Answer #1

How's the economy? A pollster wants to construct a 99.5%
confidence interval for the proportion of
adults who believe that economic conditions are getting better.
Part: 0 / 20 of 2 Parts Complete
Part 1 of 2
(a) A poll taken in July 2010 estimates this proportion to be 0.37.
Using this estimate,
what sample size is needed so that the confidence interval will
have a margin of error of 0.03?
A sample of __ adults is needed to obtain...

A
pollster wants to construct a 95% confidence interval for the
proportion of adults who believe that economic conditions are
getting better. A Gallup poll taken in July 2010 estimates this
proportion to be 0.33. Using this estimate, what sample size is
needed so that the confidence interval will have a margin of error
of 0.034 ?
Write only an integer as your answer .

A pollster wants to construct a 95% confidence interval for the
proportion of adults who believe that economic conditions are
getting better. A Gallup poll taken in July 2010 estimates this
proportion to be 0.33. Using this estimate, what sample size is
needed so that the confidence interval will have a margin of error
of 0.010 ? Write only an integer as your answer.

How's the economy? A pollster wants to construct a 99.5%
confidence interval for the proportion of
adults who believe that economic conditions are getting better.
b) Estimate the sample size needed if no estimate of P is
available.
A sample of _ adults is needed to obtain a 99.5 confidence
interval with a margin of error of 0.03.

A poll wants to construct a 95% confidence interval for the
proportion of adults who believe that economic conditions are
getting better. A poll taken in July estimates this proportion to
be 0.33 using this estimate what sample sizes needed so that the
confidence interval will have a margin of error of .081

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) Estimate the sample size needed if no estimate of
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A sociologist wants to construct a 95% confidence interval for
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