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Ch. 5 The Normal Curve • • Comparing histograms to the normal curve Interpretation of SDs and areas Standardized Units • Converting to standardized units: 1. 2. • Find the deviation from the mean Calculate the number of SDs the deviation is Example: The average age of the laid off salaried employees is 48.6 years and the standard deviation is 12.9 years. Convert 55 years to standard units. deviation from mean z SD Activity: Hand Span • Get into groups of 5-6 people • Each group should complete one handout and hand it in when finished Area Under the Normal Curve • • • • • • Area between -1 & 1 Area between -2 & 2 Area between 0 & 1 Area between 0 & 2 Area between -2 & 0 Area between 1 & 2 • Area between -1.5 & 1.5 • Area between 0 & 1.5 • Area between 1 & 1.5 • Example Set B p. 84