QMS 202 Study Guide - Quiz Guide: Interquartile Range, Standard Deviation, Box Plot

• School: Ryerson University
• Department: Quantitative Methods
• Course: QMS 202
• Professor: All

Document Summary

If whole #, use that value as percentile. If it"s x. 5, p=avg between x and x+1. If x. 25 or x. 75, then use tie breaker rule. N=population size xi=ith value of variable x. Sample variance: xi x n ( )2 i=1 s2= . X =arithmetic mean n=sample size xi=ith value of variable x. Sample standard deviation: i=1 xi x n ( )2 s= . Use mean if within 10% of each other. To calculate, use: bigger value smaller value smaller value. Approx 68% of data in bell curve is within 1 standard deviation of mean ( ) Approx 95% of data in bell curve is within 2 standard deviation of mean ( 2 ) Approx 99. 7% of data in bell curve is within 3 standard deviation of mean ( 3 ) M=total ways to accomplish 1st stage of experiment. Combination: ncr= n ! ( n r) ! n! r! (n r) !