Question

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 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

does not include

the reported proportion from​ 2009, this sample

▼

does not provide

provides

evidence that this proportion has changed since then.

Answer 1