Reseacrch commissioned by AT&T and conducted by Braun Research in 2015 polled 2,067 people in the U.S. aged 16-65 who use their smartphone and drive at least once a day. When asked if they used Facebook while driving, 558 respondents answered "yes".  a. What is the point estimate for the proportion of drives who access Facebook while driving? b. What is the margin of error for a 95% confidence interval? c. Construct a confidence interval for proportion of all drivers who take pictures while driving. d. Interpret the interval. e. An independent researcher claims that 30% of drivers use Facebook behind the wheel. Based on the interval, is the claim valid? Explain.

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