IV.10. Smoking in the United States. A July 2015 nationwide random survey of 1009 adults asked whether they had smoked cigarettes in the last week. Among the respondents, 192 said they had. Assume that the sample was an SRS.

  1. (a) Give a 95% confidence interval for the proportion of all American adults who smoked in the week preceding the survey.

  2. (b) Write a short paragraph for a news report based on the survey results.