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