Do you know that your TI-84 calculator can quickly help you find the sample covariance of a given set of data? Here, we find out exactly which buttons to press to get that job done.
pro tip, if you enter the data into the tables and then make a one line program that says "Disp (enter formula here)", then press stat, go to calc menu and select 2-var stats, it'll calculate some useful numbers, then run the program and it'll give you the answer. that way you only need to enter the formula once.
If you know the formula of correlation, it is corr(x,y)= cov(x,y)/(STD(x)*STD(y)). With algebra, cov(x,y)=corr(x,y)*STD(x)*STD(y). If you are using a TI calculator, here are the following symbol translated to the calculator r = corr(x,y) (this means correlation. AKA greek letter rho) S_x (make sure you use this instead of sigma) = STD(x) S_y = STD(y) In calculator symbol, the formula is Cov(x,y) = S_x * S_y * r You're welcome :)
@@francescorossi4876 Hmmm. I guess it depends on the course or data you put. S usually represent sample. The course I took, (mathematical finance), those were the S_x and S_y were the sample and sigma are the population
@@ken8844 yes probably just depends on the course and professor... So you must double check with some exercises and solutions to be sure you're using the right one for your test/exam!
