Compute the value of the test statistic t where the mean for a sample of 12 from the first population is 25.3 with a corresponding standard deviation of 0.31 as well as the mean for a sample of 15 from the second population is 26.9 with a corresponding standard deviation of 0.31. Enter your reply to two decimal places that is 2.12. Be sure to enter the negative sign if appropriate.
Consequently that I can see precisely how you get to the correct answer