sdada

well using 2nd data, and 2nd stat I can calculate std dev of A, std dev ov B, and correlation coefficient within 30 seconds.

Given all that, you can compute covariance in another 20 sec with corr = covAB / sigA * sigB

JPSem

ur right theres not, only for 2 variable historical data. But thats good enough.

BA II + Can do:

1 variable with prob (std dev of pop, std dev of sample, mean & of course variances)
1 variable historical (std dev of pop, std dev of sample, mean & of course variances)

2 variable historical (std dev(s) of pop, std dev(s) of sample, mean(s), variance(s) and CORR, and thus covarience can be computed in 10 sec)

ishfaque

I don't think the calcs are too bad.

the STO and RCL functions are real time savers.

waldziuchna

The calculations aren't too bad -- but there is ALOT of potential for keystroke errors. I will use the DATA and STAT function every single time I see a question like this and laugh knowing I will never make a mistake, and that it will take me about 25 seconds to compute.