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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 in? 2010, 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 as? needed.)
b. What is the margin of error for this? sample?
The margin of error=_____ ?(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 ( does not include / includes ) the reported proportion from? 2009, this sample ( does not provide / provides ) evidence that this proportion has changed since then.
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an investigation of the effectiveness of a training program to improve customer relationships included a pre-training
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