PGstatisticsmacros.pl |
topic started 9/14/2004; 2:20:59 PM last post 9/14/2004; 2:20:59 PM |

Michael Gage - PGstatisticsmacros.pl 9/14/2004; 2:20:59 PM (reads: 1388, responses: 0) |

## Statistics Macros
## Normal distributionUsage: normal_prob(a, b, mean=>0, deviation=>1); Computes the probability of x being in the interval (a,b) for normal distribution. The first two arguments are required. Use '-infty' for negative infinity, and 'infty' or '+infty' for positive infinity. The mean and deviation are optional, and are 0 and 1 respectively by default. Load PGnumericalmacros.pl in your problem if you use this method.
## "Inverse" of normal distributionUsage: normal_distr(prob, mean=>0, deviation=>1); Computes the positive number b such that the probability of x being in the interval (0,b) is equal to the given probability (first argument). The mean and deviation are optional, and are 0 and 1 respectively by default. Caution: since students may use tables, they may only be able to provide the answer correct to 2 or 3 decimal places. Use tolerance when evaluating answers. Load PGnumericalmacros.pl if you use this method. ## File path = /ww/webwork/pg/macros/PGstatisticsmacros.pl |