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Scores on an aptitude test are known to follow a normal distribution with a standard deviation...

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Basic Math

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= ?

Answer & Explanation Solved by verified expert
4.5 Ratings (977 Votes)
Solution Given thatLower confidence interval 1714Upper    See Answer
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