Chapter 6: The Standard Deviation as a Ruler and the Normal Model.

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Chapter 6: The Standard Deviation as a Ruler and the Normal Model

Shifts xX+2X-52x2x+5 Mean Q1 Q3 Min Max SD IQR

Shifted to the left What changed??

Standardizing Scores  In 2010, USA Today said teenagers miss 10 days of school per year. Mrs. Lea found by sampling 45 students the average number of days was 12 and the standard deviation was 7. Mrs. Moore found by sampling 60 students the average number of days was 15 with a standard deviation of 5. How do I compare the two data that were collected?

Standard Values = Z Scores

Normal Model 

68 – 95 – 99.7 Rule