Understanding the Normal Distribution and Numerical Integration Methods
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Learn about how Z-values are used to calculate probabilities in the Normal Distribution and why numerical integration methods like Trapezoidal and Simpson's Rule are crucial for solving complex problems efficiently.
Understanding the Normal Distribution and Numerical Integration Methods
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Presentation Transcript
The Normal Distribution… An important function that can’t be integrated (by elementary methods) and why we need numerical methods!
The Normal Distribution… • Z-values are used to calculate probabilities or estimate the fraction of a statistic that lies within a given range. • For example…. In a Math 205 Midterm exam the average score was 65% and the standard deviation was 10%. Estimate the fraction of the class that scored higher than 85%.
Where do z-values come from? • Easiest way is to numerically integrate
Numerical Integration Methods • Trapezoidal – approximate the function by a series of trapezoids • Simpson’s Method – approximate the function by a series of parabolas! • Error Simpson’s Rule is very robust and an often used numerical scheme