Question
The population standard deviation for the scores of a standardized test is 5 points. If we want to be 95% confident that the
sample mean is within 2 points of the true population mean, what is the minimum sample size that should be taken?
Provide your answer below:
20.10
1.282
test scores
Z0.05 | Z0.025 | 20.01
1.645 1.960 2.326
Use the table above for the z-score, and be sure to round up to the nearest integer.
Zo.005
2.576