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Unformatted text preview: d by the mean and standard deviation. W hen data are normally distributed, the 68-95-99.7 rule can be used to approximate the percent of data one,
two, and three standard deviations from the mean. Much of the theory of hypothesis testing is based on
having a normal distribution. We will become more adept at finding percentages (or probabilities) associated
with the normal curve, but before learning more about the normal curve and finding probabilities associated
with the normal curve, we need some foundation in probability first. The next unit will talk about probability
rules and models and then we’ll return to the normal curve. : Lesson Book page 12-1: Review Density Curves
: Lesson Book page 12-2: Review Normal Densities
Note: on page 2 of the review, remember that the percentages are approximations. Additional Reading: Chapter 6 (pages 109 through 121. Skim the sections on “z-scores” as we
will come back to z-scores in a later lesson.) Web Links: From Chapter 12 web links in the Lesson Book:
• Statistics Every Writer Should Know (gives a good explanation of
what a standard deviation is using the Normal Model)...
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This document was uploaded on 02/15/2014 for the course STAT 351 at Oregon State.
- Spring '14
- Normal Distribution