Studies have shown that drivers who use cell phones while operating a motor passenger vehicle increase their risk of an accident. Nevertheless, drivers continue to make cell phone calls while driving.

A. June 2011 Harris Poll of 2, 163 adult drivers found that 60% use cell phones while driving. a. What / who is the population?

b. What / who is the sample?

c. What quantity are we interested in estimating ? Hint: The answer to this question is NOT a number. (It is a sentence describing what the number we are trying to estimate represents.)

d. Check that the conditions for constructing a confidence interval are satisfied. 1

e. Find the critical value corresponding to an 88% confidence level. Show all your work.

f. Find the margin of error (for an 88% confidence interval). Round to the nearest thousandth.

g. Construct an 88% confidence interval. Round to the nearest thousandth. h. Interpret your interval.