and standard deviation of 8. After treatment is administered to the individuals in the sample the sample mean is found to be 33. How does sample size affect power of a hypothesis test to detect an existing error? How does sample size affect z-score?
Z score = (xbar-mu) /standard error = (xbar-mu)/(sigma/sqrt(n))
When n becomes large standard error will decrease. The power of the hypothesis will improve when we have larger sample size
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