Question

According to a census bureau,12.5% of the population in a certain country changed addresses from 2008 to 2009. In 2010,14 out of a random sample of 200 citizens of this country said they changed addresses during the previous year (in 2009). Complete parts a through c below.

A)

Construct a

9999%

confidence interval to estimate the actual proportion of people who changed addresses from 2009 to 2010.

A) 99% confidence interval to estimate the actual proportion has a lower limit of _ and an upper limit of _.

B) What is the margin of error for this sample?

The margin of error is

C)

Is there any evidence that this proportion has changed since 2009 based on this sample?

Because the confidence interval found in part a

▼

includes

does not include

the reported proportion from 2009, this sample

▼

does not provide

provides

evidence that this proportion has changed since then.

Answer #1

According to a census? bureau,
13.513.5?%
of the population in a certain country changed addresses from
2008 to 2009. In? 2010,
3131
out of a random sample of
400400
citizens of this country said they changed addresses during the
previous year? (in 2009). Complete parts a through c below.
a. Construct a
9595?%
confidence interval to estimate the actual proportion of people
who changed addresses from 2009 to 2010.A
9595?%
confidence interval to estimate the actual proportion has a
lower...

According to a census bureau, 11.5% of the population in a
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a. Construct a 95% confidence interval to estimate the actual
proportion of people who changed addresses from 2009 to 2010. A
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interval to estimate the actual proportion of people who smoked in
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A website reported that
31%
of drivers 18 and older admitted to texting while driving in
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400
drivers 18 years and older drawn in 2010,
92
of the drivers said they texted while driving. Complete parts a
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a. Construct a
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and...

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A 90 % confidence interval to estimate the actual proportion has
a lower...

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a. Construct a 95% confidence interval to estimate the actual
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The IRS reported that 62% of individual tax returns were filed
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Please spell the steps...

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b. Construct a 98% confidence interval for the proportion of
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From your data, what is the point estimate, p̂ of the
population proportion?
Write down the confidence interval that you obtained. Interpret
the result.
What is the margin of error?
Using the same data, construct a 98% confidence interval for
the population proportion. Then, answer the following three
questions:
(i) What happens to the length of the
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(ii) How has the margin of error
changed?
(iii) If the sample size is increased,
what...

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