Question

A website reported that 29% of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 800 drivers 18 years and older drawn in 2010, 176 of the drivers said they texted while driving. Complete parts a through c below.

a. Construct a 95% confidence interval to estimate the actual proportion of people who texted while driving in 2010. A 95% confidence interval to estimate the actual proportion has a lower limit of nothing and an upper limit of nothing. (Round to three decimal places as needed.)

b. What is the margin of error for this sample?

The margin of error is nothing.______ (Round to three decimal places as needed.)

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?** the reported proportion from
2009, this sample **provides?** evidence that
this proportion has changed since then.

Answer #1

A website reported that
31%
of drivers 18 and older admitted to texting while driving in
2009. In a random sample of
400
drivers 18 years and older drawn in 2010,
92
of the drivers said they texted while driving. Complete parts a
through c below.
a. Construct a
90%
confidence interval to estimate the actual proportion of people
who texted while driving in 2010.A
90%
confidence interval to estimate the actual proportion has a
lower limit of
nothing
and...

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A 90 % confidence interval to estimate the actual proportion has
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previous year? (in 2009). Complete parts a through c below.
a. Construct a
9595?%
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9595?%
confidence interval to estimate the actual proportion has a
lower...

It was reported that 63% of individual tax returns were filed
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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
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certain country changed addresses from 2008 to 2009. In 2010,14
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parts a through c below.
A)
Construct a
9999%
confidence interval to estimate the actual proportion of people
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A) 99% confidence interval to estimate the actual proportion
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The IRS reported that 62% of individual tax returns were filed
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2010 was selected. From this sample, 163 were filed electronically.
a) Construct a 95% confidence interval to estimate the actual
proportion of taxpayers who filed electronically in 2010. b) What
is the margin of error for this sample? c) Is there any evidence
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sample?
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n=

The Centers for Disease Control reported the percentage
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A sample of 2185 is taken with a margin of error of .02 by using
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The Centers for Disease Control reported the percentage
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a. How large a sample should be taken to estimate the proportion
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b....

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