135 Measures of Variability and Correlation Review Worksheet for EXAM 2 Standard Deviation of Sample (Computational - Shortcut) Standard Deviation of Sample (Definitional) SX = =(x2) -9 ( Ex) 2 N SX = E(x-x)2 N N Standard Deviation of Estimated Population Sample's Santard Deviation (Computational - Shortcut) Standard Deviation of Estimated Population (Definitional SX = E(x2) _(x)2 = SX = E(x-x) 2 N-1 N-1 Population's Standard Deviation Sample's Standard Deviation: o = Standard Deviation of Population Sx = Standard Deviation of Sample u = mean of population Sx = Standard Deviation of Estimated Population x = mean of sample 1. You measure the temperature for the last 12 days. The temperatures in Fahrenheit have been the following: Case OF #1 62 #2 55 #3 64 #4 65 # 5 68 #6 68 #7 69 #8 72 #9 73 #10 79 #11 74 #12 83 a. What is the mean? 42, 55, 44, 45, 48, 48, 69, 72, 73, 79, 74, 83 12 108