Critical values of the t-distribution at t.025:

I didn't want to type these in, so I googled for them.  Couldn't find them
conveniently outside PDFs or Powerpoint files in google, so here are some easy
to cut and paste for the next person who needs these.

my @tdist_025 = (
        12.706, 4.303, 3.182, 2.776, 2.571, 2.447, 2.365, 2.306, 2.262, 2.228,
        2.201, 2.179, 2.160, 2.145, 2.131, 2.120, 2.110, 2.101, 2.093, 2.086,
        2.080, 2.074, 2.069, 2.064, 2.060, 2.056, 2.052, 2.048, 2.045, 1.960
);


float tdist_025[] = {
        12.706, 4.303, 3.182, 2.776, 2.571, 2.447, 2.365, 2.306, 2.262, 2.228,
        2.201, 2.179, 2.160, 2.145, 2.131, 2.120, 2.110, 2.101, 2.093, 2.086,
        2.080, 2.074, 2.069, 2.064, 2.060, 2.056, 2.052, 2.048, 2.045, 1.960
};

obkeywords: statistics, degres of freedom, t-distribution