Importing data into inference app

[mbeddo]

(02-05-2015 08:17 PM)Tim Wessman Wrote:  I suppose that adding a "estimate standard deviation" check box or something could possibly resolve this situation, but I feel it would do so to the detriment of students. n>30 is an old rule and does not always apply. I could add more and more options for the import, but the complexity would far outweigh the benefits.

I appreciate your views on this, but I think some thought should go into redesigning the Num view for Z tests. Showing a default number 0.2887 regardless of what gets imported thoroughly confused me and spawned this round of exchanges.

Maybe the sigma inputs should be made empty after importing data, with the "Calc" soft menu in an inactive state, until both population sigmas are provided. I think having 0.2887 there will be just as detrimental to students as it doesn't reinforce the fact that one must know the population sigmas (is this possible in the real world?) before doing a Z-test.