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...Introduction in designing experiments need to know what number of individuals would be optimal detect differences between groups typically a control versus treatment also like given the chance we might have difference biological hypotheses hypothesis is statement expected background literature and knowledge that has accumulated on subject suppose you had sample week old male cbl mice wanted test whether they came from population whose average body weight grams then formulate following hypothesize statistical analyze data set up null alternative h o alternate use appropriate statistic accept if p reject relate conclusion back types error when or are two true making type i false ii do able acceptance rejection probabilities probability this varies power...