Qusetion: A website reported that 31% of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 200 drivers 18 years and older drawn in 2010. 53 of the drivers said they texted while driving. Complete parts a through c below.
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 squarebox and an upper limit of squarebox. (Round to three decimal places as needed.)
What is the margin of error for this sample? The margin of error is squarebox. (Round to three decimal places as needed.)
Is there any evidence that this proportion has changed since 2009 based on this sample? Because the confidence interval found in part a the reported proportion from 2009, this sample evidence that this proportion has changed since then.