Scores on an aptitude test are known to follow a normaldistribution with a standard deviation of 32.4 points. A randomsample of 12 test scores had a mean score of 189.7 points. Based onthe sample results, a confidence interval for the population meanis found extending from 171.4 to 208 points. Find the confidencelevel of this interval.
Margin of Error (ME)= ?
Z-Score (Z-a/2)= ?
Confidence Level= ?
