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(squeaking) (ding) - I wanted to check back with you regarding my project on testing for differences in TNF alpha levels after spinal cord injury between rats treated by a drug versus those that did not receive the treatment. What is the sample size required for your calculations? - Well for the sample size and power calculations, you will need a total sample size of at least 30. - Okay so I have 10 rats that I can use, and Ill extract three samples from each rat and then that will give me a sample size of 30? - 30 measurements from 10 rats will not meet your goal of sample size. You will need 30 independent rats. - Oh, okay. So why is that? - If you take three measurements from the same rat, then these three measurements are not independent. Those three measurements generated from the same rat are really technical replicates. By technical replicates we mean multiple measurements from the same sampling unit, in your case, rats. These technical replicates represent independent measure