Don't beat yourself up over one test, and also don't give up on what you want to do! Just remember, right now you are learning the basics of these concepts, not expected to be a math whiz. When you actually get into your profession, chances are you won't ever have to calculate another thing by hand - that's what computers are for! It's much more important that you know some reasons why you run certain tests, etc. If you ever needed to run an experiment that called for a test of significance, you would never do it without a computer (and you also would have access to everything you needed to make decisions about what to do). It sounds like you are doing great overall!
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