The effect of a drug to change in heart beat by 5 beats per minute over 48 hours in either direction. A two sided test conducted at the 0,05 level of significance will be used. What sample size is needed for this study.
The mean for the population u = 75 beats per minute STD = 10 beats per minute .05 level of significance Power = 80%
What is the sample size needed?
Z = 1.645 because of the level of significance is 0.05 for H Z = beta 1-beta = .80 1-.80 = .20 = Z = .84
X = 75
n =[ (1.645 + .84)(10)}/70-75}]2 {(2.485 * 10)/-5}2= 24.5/-5 = 4.972 = 25 = n
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