Normal population distribution plot
[DOC File]QMETH 490 Note 1: Testing for Normality
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Normal Probability Plot of Data From an Exponential Population Distribution. The plot on the right is a normal probability plot of observations from an exponential distribution. The plot is convex. Jarque-Bera Statistic. A normal probability plot test can be inconclusive when the plot pattern is not clear.
[DOC File]The normal distribution
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The central limit theorem states that, as sample size increases, the distribution of sample means drawn from a population of any distribution will approach a normal distribution with mean µ and variance σ2/n. P(0.42(Z ( 1.61)= P(Z ( 0.42) - P(Z ( 1.61)= 0.3372 - 0.0537 = 0.2835 . From Table. P(Z ( 1.17)= 0.121 (pb inside Table) If asked
[DOC File]CHAPTER 8—SAMPLING DISTRIBUTIONS
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2. A Normal Probability Plot is a plot that will yield a straight line if the data came from a Normal population. 3. A test in which Ho: The data came from a Normal population and HA: The data came from a Non-Normal population. The following examples will illustrate all three methods.
[DOCX File]Open Michigan
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The QQ plot on the far right shows evidence of an underlying distribution that has shorter tails compared to those of a normal distribution. Note: Many inference procedures, including some you will use later in the semester, require the assumption of normally distributed population(s).
[DOC File]Procedure
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3. Population distribution is given as normal OR n > 40 (meaning t procedures are robust even if skewness and outliers exist) OR 15 < n < 40 with normal probability plot showing little skewness and no extreme outliers OR n < 15 with npp showing no outliers and no skewness Test for mean µ when σ is unknown (Ho: µ = µo)
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