How to do a t test (biology)

I'd make a cup of coffee or pick up a red bull before you start this one. But I do go through step-by-painful-step using an example question on how to do a t test including: 1. How to decide whether or not a t test is appropriate 2. Calculating mean, variance and t 3. determining degrees of freedom and critical value 4. making an appropriate conclusion Episode 1: overview of all three tests (how to do statistical tests):    • Statistical tests in (A level) biology   Episode 2: How to do a t-test:    • How to do a t test (biology)   Episode 3. How to do a Chi-squared test:    • How to do: chi-squared test for (A level) ...   Episode 4: How to do a Spearman rank correlation test:    • How to do: Spearman Rank correlation test ...