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Applied Math 40S March 24, 2008
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Applied Math 40S March 24, 2008

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Working with z-scores using modified and standard normal distribution; understanding and applying the invNorm() command on the TI-83 calculator.

Working with z-scores using modified and standard normal distribution; understanding and applying the invNorm() command on the TI-83 calculator.

Published in: Education, Technology

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  • 1. Working with z-scores and the Normal Curve ... it's everywhere! Green House by the Laundry by Dylan James
  • 2. The Standard Normal Distribution The normal distributions used up to this point have all been non- standard normal distributions. This means that the mean and standard deviation of the distribution are the mean and standard deviation of the data being studied. In a standard normal distribution, the scale on the x-axis is the z-score (a standard score) where 'z = 0' is the mean, and the standard deviation is '1'. The distribution is a probability distribution where the area under the curve = 1. This means there is a 100 percent chance of every score being included in this distribution. Other probabilities are illustrated below.