Texas Instruments TI-84 PLUS SILV Guidebook - Page 249
normalpdf, A: binompdf, C: poissonpdf, E: geometpdf, DISTR DRAW
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DISTR DRAW A: binompdf( B: binomcdf( C: poissonpdf( D: poissoncdf( E: geometpdf( F: geometcdf( Binomial probability Binomial cumulative density Poisson probability Poisson cumulative density Geometric probability Geometric cumulative density Note: L1â99 and 1â99 specify infinity. If you want to view the area left of upperbound, for example, specify lowerbound= L1â99. normalpdf( normalpdf( computes the probability density function (pdf) for the normal distribution at a specified x value. The defaults are mean m=0 and standard deviation s=1. To plot the normal distribution, paste normalpdf( to the Y= editor. The probability density function (pdf) is: f(x) = ------1-------- --(---x 2 e 2σ2 ,σ > 0 2πσ normalpdf(x[,m,s]) Note: For this example, Xmin = 28 Xmax = 42 Xscl = 1 Ymin = 0 Ymax = .2 Yscl = .1 Note: For plotting the normal distribution, you can set window variables Xmin and Xmax so that the mean m falls between them, and then select 0:ZoomFit from the ZOOM menu. normalcdf( normalcdf( computes the normal distribution probability between lowerbound and upperbound for the specified mean m and standard deviation s. The defaults are m=0 and s=1. Chapter 13: Inferential Statistics and Distributions 242