A website reported that 31%of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 200drivers 18 years and older drawn in2010, 52of the drivers said they texted while driving. Complete parts a through c below.

a. Construct a 99% confidence interval to estimate the actual proportion of people who texted while driving in 2010.

A 99% confidence interval to estimate the actual proportion has a lower limit of ___and an upper limit of____

(Round to three decimal places asneeded.)

b. What is the margin of error for thissample?

The margin of error is_____

(Round to three decimal places asneeded.)

c. Is there any evidence that this proportion has changed since 2009 based on thissample?

Because the confidence interval found in part a______(includes, does not include),the reported proportion from2009, this sample________(provides, does not provide)evidence that this proportion has changed since then.

(we use the EXCEL)