statistics
posted by marsha on .
for a hypothesis comparing two population means, what is the critical value for a onetailed hypothesis test, using a 5percent level of significance level, with both sample sizes equal to 13? the standard deviations for the samples are 5 and 7. assume the population standard deviations are unequal

If you have equal sample sizes and unequal standard deviations, a Welch's ttest might be appropriate. Check degrees of freedom for this type of test before checking the appropriate table to determine critical value.