These are some TI-89
calculator programs written to speed up AP Stats homework.
Gives the mean and
standard deviation of a specific binomial distribution, given n and
p. Run "binmstat(n,p)" to execute.
Gives the mean and
standard deviation of a specific geometric distribution, given p.
Run "geomstat(p)" to execute.
Gives the Chi^2 and P
values given pairs of observed and expected values, and df. Run
"chi()" and enter df, then enter pairs of values until finished,
and read off the values printed at top. Type -1 for observed value
to restart the program, or -2 to quit.
Gives the mean, variance,
and standard deviation for a given probability distribution. Create
two lists, one with x-values and one with corresponding p-values.
Run "probstat(x,p)" where x is the location or name of the x list
and p is the location or name of the p list.
Calculates the standard
error of residuals about the regression line c=b(+/-)t*SE, where
SE=s/sqroot(sum(x-xbar)^2), and t=b/SE. Make a list of residuals.
Run "residse(list)" where list is the location or name of the
residuals list.
Calculates the degrees of
freedom of a two-sample system using the ugly, hard-to-remember
equation. Run "twosamdf(Sa,Na,Sb,Nb)" if you can figure out what
the variables mean.