Error in Statistics 1Var Report

01262015, 01:42 PM
Post: #1




Error in Statistics 1Var Report
I think that the values for the sample and population standard deviation estimates are switched when using the Stats 1Var app. For example, I open the app and store data 88, 90, 89, 65, 70, and 89 in D1. I press "Stats" and see that sX (sample standard deviation) is 11.2323936 and sigmaX (population standard deviation) is 10.2537256. This answer makes no sense because the bias correction always produces an estimate for the population that is larger than for the sample.
If I use stddev(D1) the estimate is 10.2537256102. If I use stddevp(D1) the estimate is 11.2323936303. I verified these values by hand calculation. So it isn't that the HP Prime calculation is wrong, but that the report in the app is wrong. Also, if I use Vars > App > Statistics 1Var > Results > sX or sigmaX, I get the wrong value returned. The values for these two estimates are switched in the app. 

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Messages In This Thread 
Error in Statistics 1Var Report  mark4flies  01262015 01:42 PM
RE: Error in Statistics 1Var Report  mbeddo  01262015, 03:46 PM
RE: Error in Statistics 1Var Report  Tim Wessman  01262015, 03:58 PM
RE: Error in Statistics 1Var Report  mbeddo  01262015, 04:12 PM
RE: Error in Statistics 1Var Report  Tim Wessman  01262015, 04:29 PM
RE: Error in Statistics 1Var Report  John P  01262015, 05:40 PM
RE: Error in Statistics 1Var Report  mark4flies  01262015, 06:16 PM
RE: Error in Statistics 1Var Report  JimS  01262015, 10:51 PM
RE: Error in Statistics 1Var Report  parisse  01272015, 06:50 AM
RE: Error in Statistics 1Var Report  John P  01272015, 03:23 PM

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