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method a n=50 mean= 14 days s1= 4 days method B n = 30 mean=12.5 days and s2=4 days what are the null and alternative

method a n=50 mean= 14 days s1= 4 days method B n = 30 mean=12.5 days and s2=4 days what are the null and alternative hypothesis in this case?

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