A random sample is selected from a normal population with a mean of 30....

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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?

Nov 21st, 2014

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


Nov 21st, 2014

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Nov 21st, 2014
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