For this question\"A pharmacological manufacturer is concerned that a new drug u

Question

For this question"A pharmacological manufacturer is concerned that a new drug used to control hypertension may alter fasting blood glucose (FBG). What sample size would he or she need in a randomized clinical trial (equal numbers of subjects given the new drug or placebo) to have 80% power to detect a 5 point difference in FBG if the standard deviation of FBG in the population is 19?" I am getting an answer of 227 using what I think are the correct formulas. This is vastly different than what is already in Chegg. These are the two formulas I am using...

Explanation / Answer

why in your formula of Ni you are using a factor of 2. That is not required.

If you are using a type I errror level of significance 0.05 ; the answer should be 114. Please revert on this or where exactly you are facing problem so that IO can elaborate,

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