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 ▼ Alexandre KAMP Junior Member Posts: 1 Threads: 1 Joined: Jan 1970 10-12-2002, 05:06 PM Can anyone remind me how I can enter (xi,yi) datas on my HP15C and then find out the statitics results : - Sum(xi) - Sum(yi) - Sum (xi*yi) - and so on ... ▼ Tom Sherman Member Posts: 95 Threads: 7 Joined: Jan 1970 10-12-2002, 05:22 PM Entering statistical data on HP-15: y value (Enter) x value (SUM+) key to the left of + repeat as many times as you have data points Data are stored in the following registers: R2: n, # of data points R3: sum of x values R4: sum of x^2 R5: sum of y R6: sum of y^2 R7: sum of xy Recall data by pressing RCL key followed by number of register. Sorry about the bad formatting of this posting -- I don't know how to correct it. ▼ Vieira, Luiz C. (Brazil) Posting Freak Posts: 4,027 Threads: 172 Joined: Aug 2005 10-14-2002, 11:26 PM Hi, Tom; if you have the time for it, read this here. If not, here is the tip: if you have a text you want to be seen exactly as you type it here, with all line-feeds and monotyped spaces, simply put a [pre] before its first character and a [/pre] after its last character. Your text would look like this: ```R2: n, # of data points R3: sum of x values R4: sum of x^2 R5: sum of y R6: sum of y^2 R7: sum of xy``` To accomplish this, you type: ```[pre]R2: n, # of data points R3: sum of x values R4: sum of x^2 R5: sum of y R6: sum of y^2 R7: sum of xy[/pre]``` Hope it helps. Stephan Junior Member Posts: 35 Threads: 6 Joined: Jan 2013 10-12-2002, 05:38 PM To clear stat registers press: f CLEAR Sigma To enter pairs (xi, yi) press: yi ENTER xi Sigma+ RCL 2: number of elements (pairs) RCL 3: sum(xi) RCL 4: sum (xi**2) RCL 5: sum (yi) RCL 6: sum (yi**2) RCL 7: sum(xi*yi) g x: average x x <--> y : average y Linear regression y = m * x + b f L.R. returns b x <--> y returns m ▼ Thibaut.be Senior Member Posts: 610 Threads: 53 Joined: Aug 2005 10-13-2002, 02:51 AM look at the back of your 15C : there is a summary of all stats registers. ▼ R Lion (Spain) Senior Member Posts: 294 Threads: 32 Joined: Jul 2005 10-17-2002, 02:12 PM Perhaps someone could be interested... I've some own programs for statistics for the 15C: Entering Data with frequencies (one or two variables) Confidence interval for mean and sample size Confidence interval for proportion and sample size Binomial distribution B(n,p) Normal standard distribution and inverse Normal s. distr. If you want, feel free for mailing me Raul

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