So I'm supposed to perform a hypothesis test with: sample size = 27 sample mean = 10.7 sample standard deviation = 3.6 Because the sample size is small and population standard deviation is unknown, I have to perform a t-test to see if I can reject my null hypothesis. I find that the t-score is -0.43 and: $p-value =2p(t_{26} > 0.43)$ This is the t-table I will be provided in tests/exams at my school: https://drive.google.com/file/d/0BxUaD_pbAL2hQzE0dzZtVHhsSlU/view There is no value close to 0.43 in the row of df = 26 on the t-table, so what do I do? Am I supposed to use the z-table instead? Or is using R or some other computational program the only possible way to find the p-value? Also, regarding the t-table I linked, is this table only for one-tailed t-tests? If so, what do I do if I need to do a two-tailed test (like in this example)?