Question
A website reported that 32 % of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 400 drivers
A website reported that 32% of drivers 18 and older admitted to texting while driving in 2009. In a random sample of 400
drivers 18 years and older drawn in2010, 94 of 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=_____ (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 ( does not include / includes ) the reported proportion from2009, this sample ( does not provide / provides ) evidence that this proportion has changed since then.
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