Answer to Question #3727 in Statistics and Probability for tami
Alternative hypothesis - the difference between two means is not zero.
Test statistics can be found by the formula
where x1, x2 - 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.
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