The population standard deviation for the scores of a standardized test is 4 points. If we want to be 90% confident that the
sample mean is within 1 point of the true population mean, what is the minimum sample size that should be taken?
20.10
20.05 20.025 20.01 20.005
1.282 1.645 1.960 2.326 2.576
Use the table above for the z-score, and be sure to round up to the next integer.
Provide your answer below:
test scores
