rgonzalez

to calc covariance and std deviation
2nd stat

enter each x and y value (if doing st dev just enter x values) hit enter and arrow down after each value. for 15% put in .15


after putting all data points in 2nd data
make sure its in LIN mode
arrow down till u get to Sx....Sx equals std deviation of all X inputs (if you are solving for only standard deviation u are done......but wait its gets better....Sx is sample std deviation...if you need population std dev hit arrow down one more and it looks like the std dev sign and x. that is population std dev.)

to calc covariance
when u see Sx hit STO 1
hit down arrow keys until u see Sy- which is std dev of Y values.....hit STO 2
hit down arrow keys until u see R- which is correlation coeffcient...hit STO 3
hit CE/C bottom left
hit RCL 1 X RCL 2 X RCL 3 =

practice with a problem u know...and u will see after practice u can calc this on the BA II + in 30 sec tops

HOLLLLAAAAAAAAAAA....EFF DOING CALCS by hand!!!!!!