4. In a random sample of 1480 adults, 455 of the respondents have sleepwalked. a) Let p represent the proportion of all adults who have sleepwalked. Find a point estimate for p rounded to 3 decimals places. b) Find 90% and 99% confidence intervals for p, again rounded to 3 decimal places. c) Using your 99% confidence interval from part b), make a conclusion about the results of drawing the sample. d) Describe what happens to the width of the confidence interval as the level of confidence increases