Here is a basic question. A person I know has a dataset with two columns. When they do a normality test for each column, it passes. One they do a hypothesis test for a two sample t-test in Minitab, the data shows a p-value of 0.229. Other t tests they ran on columns shows the P value = 0. What could be the cause of this? Do I need to run other tests, to find out the root cause? Which test? F-Test? Would that help? Any other test?