Stats Tester, Easy statistics

9/1/2020

+ Added [Shapiro-Wilk test (Normality)] and [Normal probability plot].
+ Added Kurtosis (a4) to [1. Mean, SEM and SD, etc]. (If a4 = 3 --> Normal distribution.)
+ Added explanations of Skewness and Kurtosis to HELP on [1. Mean, SEM and SD, etc].
+ Fixed crush bug in [Median test] when Number of data (n1+n2) is larger than 100.
+ Made minor improvements in wording in HELP for some tests.