Identify the type of sampling used. Every fifth adult entering an airport is checked for extra security screening. What sampling technique is used? A. cluster B. systematic C. stratified D. simple random E. convenience -Find the sample standard deviation. Round to one decimal place. 8, 18, 11, 8, 9, 9, 6, 7, 16 A. 16.9 B. 3.9 C. 15.1 D. 4.1 -The scores from a state standardized test have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of students with scores between 70 and 130. A. 100% B. 99.7% C. 95% D. 68% -Find the z-score for the value 87, when the mean is 82 and the standard deviation is 8. A. z=0.96 B. z=0.96 C. z=0.63 D. z=0.50