2061_10%20Day%2010_Working%20with%20Z-scores%20BB-1

# 2061_10%20Day%2010_Working%20with%20Z-scores%20BB-1 - Day...

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Click to edit Master subtitle style 2/24/10 Day 10: Working with Z- Scores Why are Z-scores useful? What questions can we answer using Z-scores? Working through examples

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2/24/10 Why are Z-scores useful? Review: What is a Z-score? Review: If a Z-score is 1.45, that tells us that the value is: A. 1.45 times higher than the mean B. 1.45 standard deviations above the mean C. 1.45 units above the mean What makes a Z-score more meaningful than the distance
2/24/10 What questions can we What percentage of a distribution falls between a given value and the mean? What percentage of a distribution falls beyond a given value (between the value and the end of the distribution)? What percentage of a distribution falls between two given values?

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2/24/10 Statistics grades (example from Mean = 70.07, Mode = 70, Median = 70 Normal distribution Standard deviation = 10.27 Table 10.1 Final Grades in Social Statistics of 1,200 Students (1983-1993) Midpoint Score Frequency Bar Chart Freq. Cum. Freq.
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2061_10%20Day%2010_Working%20with%20Z-scores%20BB-1 - Day...

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