The data I'm using has a normal distribution with the same variances. I want to do a test of hypotheses however at a significance level of 5% (a=0.05) to be able to confirm whether or not the average duration that older adults can remain standing is larger than among younger adults.
I'm not sure which of the different formulas I should use however to determine this due to my sample size being relatively small. Should I be using the following test.
to compute pooled standard deviation:
compute test statistics: