4. Finding a Sampie Proportion and Margin of Error The article \"HighDose Nicotine Patch Therapy," by Dale, Hurt, et al. (Journal of the American Medical Association, Vol. 274, No. 17) includes this statement: "Of the 71 subjects, 70% were abstinent from smoking at 8 weeks (95% confidence interval [CI], 53% to 87%)." Use that statement to nd the point estimate f5 and the margin of error E. (4 pts) 3. Find the point estimate b. Find the margin of error 5. What Percentage of Aduits Make Online Purchases? A 2016 Pew Research Center survey of 456? randomly selected US. adults showed that 89% of the respondents shop online. If we want to conduct a new survey to determine whether that percentage has changed. how many adults must be surveyed in order to be 99% confident that the sample percentage is in error by no more than three percentage points? (6 pts) a. Assume that 89% of adults make online purchases. b. Assume that we have no prior information suggesting a possible value of the population proportion