The free version of the VPRo statistical tool allows you to perform calculations regarding:
** Central limit theorem for:
-> An average
-> Sums
-> The difference of means

** Confidence intervals for:
-> A mean (Whether the population variance is known or not)
-> Difference of means if the population variances are known
-> Difference of means if the population variances are unknown but they are known to be the same
-> The ratio between variances
-> For a proportion

** Hypothesis tests for:
-> A mean (If the population variance is known)
-> Difference of means if the population variances are known
-> For a proportion

The VFree Statistics tool not only allows you to perform the calculation, it also generates the well explained procedure of how the result was arrived at, with the calculations performed, with the theorems used and with the values ​​in tables obtained.
Wait no more and try the VFree Statistics tool