A calculator

May I suggest adding a 'calculator' programmed to provide answers to some commonly used statistical 'questions'. For example:

a. calculate pooled SDs/variances
b. compare two standard deviations
c. t-test between percents
d. confidence interval around a percent
e. two sample t-test between percents
f. confidence interval around a mean
g. t-test between means
h. probability of a z-value
i. critical z for a given probability
j. probability of an F-ratio
k. probability of a t-value


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