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2-1 Day 1 Density Curves and the Normal Distribution

# 2-1 Day 1 Density Curves and the Normal Distribution - AP...

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AP Statistics Lesson 2.1 Density Curves and the Normal Distribution.

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Essential Question: How are Density Curves and Normal Curves used to analyze data? Objectives: To solve problems involving Density Curves. To use the Normal Curve to analyze data.
Strategies for exploring data on a single quantitative variable. Always plot your data: make a graph, usually a histogram or a stemplot. Look for the overall pattern ( shape, center, spread) and for striking deviations such as outliers. Calculate a numerical summary to briefly describe the center and spread. Sometimes the overall pattern of a large number of observations is so regular that we can describe it by a smooth curve.

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Density Curves The smooth curve drawn through the tops of the histogram bars is a good description of the overall pattern of the data. The curve is a mathematical model for the distribution. The mathematical model is an idealized description.
Density Curves A Density Curve is a curve that is always on or above the horizontal axis.

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