Fisher’s Exact Test of Independence -- A plant ecologist designs a study to dete

Question

Fisher’s Exact Test of Independence -- A plant ecologist designs a study to determine whether trees rooted in serpentine soils have pubescent leaves. She samples 100 trees of a rare species from a 400-mile2 area. She records for each tree whether or not it is rooted in serpentine soils and whether its leaves are pubescent or smooth. The observed data are presented below.

Soil                                         Pubescent              Smooth

Serpentine                             12                           22

Not Serpentine                     16                           50

Use SAS to perform Fisher’s exact test of independence to test Ho.

Graph the relative frequencies of the observed data.

Explanation / Answer

the question raised about two variables by the chai-square test will get exact valuve of the variables.

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