Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
USING THE T1-82 FOR STATISTICS sheet 2 CALCULATING MEAN, MEDIAN, QUARTILES, VARIANCE eg: x f 0 4 1 12 2 33 DATA IN FORM OF A FREQUENCY DISTRIBUTION Press STAT button, then EDIT , ENTER ( one variable) Enter your x values into L1 Enter the frequencies into L2 L1 L2 0 1 2 3 4 12 33 26 L3 L4 L5 3 26 L6 Press STAT button, across to CALC, down to 1 - Var Stats, ENTER 1 - Var Stats appears on the screen, put in L1 , L2 press ENTER (note you must put a comma between L1 and L2 ) Check your value of n This gives: x 2.08 x 156 x 378 2 sample mean sum of x sum of x 2 Sx 0.8504... sample standard deviation x 0.8447... population standard deviation n 75 minX 0 Q1 2 lower quartile Med 2 median Q3 3 upper quartile maxX 3 population mean FORMULA FOR CALCULATING THE MEAN: x sample mean fx f fx f FORMULA FOR CALCULATING STANDARD DEVIATION: population standard deviation sample ' standard deviation ' f (x ) n 2 n f (x ) s n 1 n (unbiased estimate of population standard Note: variance = (standard deviation)2 fx 2 n 2 2 where n f deviation)