Null hypothesis is that the difference between the two groups is 0.
Alternative hypothesis - the difference between two means is not zero.
Test statistics can be found by the formula
- are the means of two samples, SD1,2
- standard deviations , n1,2
- the number of observations of two samples respectively.
Then you have to calculate the number of degrees of freedom:
and find p-value from the tables (or using t to p value calculator).
If p-value is more than 0.1 (performing two-sided test you must use doubled alpha), we do not reject the null hypothesis; otherwise - we reject it.