1. ECON 338/ENVR 305 CLICKER QUESTIONS Statistics – Question Set #2 (from Chapter2)

2. Based on the empirical rule for bell-shaped distributions, about _____ % of the data lie within 1 standard deviation of the mean. 1. 68 2. 95 3. 97.47 4. 98.26 5. 99.7 Response Counter

3. The mean and standard deviation of the scores obtained by students in a class of 20 are µ= 75 and σ = 3.4. The z-score of one of the students is z = 2.85. What is his score? 1. 72.55 2. 77.45 3. 84.69 4. 88.48 5. 82.95 Response Counter

4. Chebyshev’s Theorem states that for any numerical data set, at least _____ of the data lie within 2 standard deviations of the mean. 1. ¾ 2. ½ 3. 8/9 4. 2/5 5. 1/4 Response Counter