2.6 Measures of Spread. Measures of Spread Measures or Spread Vs. Central Tendency.

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Presentation transcript:

2.6 Measures of Spread

Measures of Spread Measures or Spread Vs. Central Tendency

Deviation

Standard Deviation A “cool” way of finding the average of the deviations. Ideas on how?

Population Standard Deviaiton

Sample Standard Deviation

Example Use means and standard deviations to compare the heights of the 2 basketball teams. FalconsRavens PlayerHeight (cm)PlayerHeight (cm) Laura183Sam166 Jamie165Shannon163 Deepa148Tracy168 Colleen146Claudette161 Ingrid181Maria165 Justiss178Amy166 Sheila154Selena166

Standard Deviation FalconsHeightDeviation, x-µ(x-µ) 2 Laura183 Jamie165 Deepa148 Colleen146 Ingrid181 Justiss178 Sheila154 SUM

Standard Deviation RavensHeightDeviation, x-µ(x-µ) 2 Sam183 Shannon165 Tracy148 Claudette146 Maria181 Amy178 Selena154 SUM

Box and Whisker Plot Divided the data into 4 equal groups. Uses Medians 1 st quarter, second quarter, third quarter, fourth quarter

Example A random Survey of people at a science-fiction convention asked them how many times they had seen Star Wars. The results are as follows Make Box and Whisker Plot

Assignment Pg 148 #’s 1-3,6,7