Read 2 classmate's posts and reply to them about how their note taking is similar or different from your own. 1 classmate's post I usually just take notes from the textbook. I write out some definitions, and some formulas for solving different math problems. I'm not the best note taker, so I just write out the main points and highlight them, so it is easier for me to find them, if I need help remembering how to solve something. I'm excited to see how others take notes, so that I can make do mine a little better and more useful!

Ch 3 Notations X = variable of interest n= number of observations in data set Xj = 15 observation in data set X2 : 2 0 observation in data set Xn = last observation in data set Sample mean-arithmetic average of values in a sample . Sum of all obsenations # of all observations Population mean denoted by M. arithmetic average of all x values in an entire population . Deviation from the mean= subtract sample mean x from observation to get ( X- X ) Sample variance- denoted by S' sum of squared deviations from the mean divided by 1- 1. 53. [ / x - X ) 2 not Sample Standard deviation? Denoted by's square root of the sample vanance S=VS2 2 8(X - 8)2 n - 1Stats notes - practice / review mean practice example - (1 18+23 + 56 + 78 + 85= 260 18 , 23 , 56 , 78, 85 2 260/5 = 52 first step when finding mean : add the numbers to find the sum next : divide by the # of values median practice first step : rearrange values in numerical order least to greatest next: find the value in the middle examples 48 , 23 , 72 , 86 , 7 7 . 23 , 48 , 72 , 86