A study was conducted to study college students who smoke to nd if there was a relationship was between number of cigarettes smoked per day and parental smoking status. The study recruited 300 college students who currently reported smoking. In the study. the adult children of smokers smoked approximately 4 cigarettes more per day than the adult children of non-smokers. The 95% condence interval for the difference was 3.4 to 5.3 cigarettes per day. If we wanted to reduce the size of our condence interval (that is, reduce the width), which of the following would help? Select all that apply. 7 A. We could calculate the 99% confidence interval instead. 7 B. None of these will have an impact on the size of the condence interval. _ c. Perform a new study with less college students. _ D. We could calculate the 90% confidence interval instead. _ E. Redo the study with the same number of adults, but include more than just college students. _ F. Recruit more college students to participate in our study