The 15.7 denotes a (Select all that Apply) "' Population Proportion Sample Mean "\" Population Mean Sample Statistic "i' Sample Proportion Use the following information to answer questions 19 through 21. The CDC also wants to know how many cigarettes on average does US smokers smoke per day. They randomly select 2,000 adults and found that the average number of cigarettes smoked per day by smokers was 15.7