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Monster Media 1993 #2
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1990-05-28
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Comparing the Standard Normal and Student's t distributions
This is a self extracting archive with 6 CGA graphics screens:
not1 std normal pdf and Student's t pdf with 2 df
not2 std normal pdf and Student's t pdf with 8 df
not3 std normal pdf and Student's t pdf with 32 df
not4 std normal and 32 df t reliability functions (1 - cdf) -5 < x < 5
not5 std normal and 32 df t reliability functions (1 - cdf) 1.5 < x < 3
not6 % diff between the functions shown in not5, 100 * (t - n) / t
Despite the apparently good agreement between the distributions in not3 and
not4, there is large percentage difference in the upper tail, seen in not5
and not6. P values from the normal are not good estimates of p values from
the t with 32 df. Use t tables that stop at 30 df with caution.
files: not1.com - not6.com the CGA screens as self displaying com files
*.spc specification files used by kspdat
*.d##, *.c## data and codebook files generated by kspdat
not.doc discussion of how to do this
not.gnu gnuplot 2.0 commands used to generate plots
The files occupy about 200k on disk. Do you want to extract the files now?