A sample of 30 PLM EDA students from the College of Engineering were given an IQ test. The sample has been found to have a standard deviation of 12.23 points. (a) Find an 90% confidence interval for the whole PLM EDA students in the college. (b) Find an 97.5% confidence interval for the whole PLM EDA students in the college.

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A sample of 30 PLM EDA students from the College of Engineering were given an IQ test. The
sample has been found to have a standard deviation of 12.23 points.
(a) Find an 90% confidence interval for the whole PLM EDA students in the college.
(b) Find an 97.5% confidence interval for the whole PLM EDA students in the college.
Transcribed Image Text:A sample of 30 PLM EDA students from the College of Engineering were given an IQ test. The sample has been found to have a standard deviation of 12.23 points. (a) Find an 90% confidence interval for the whole PLM EDA students in the college. (b) Find an 97.5% confidence interval for the whole PLM EDA students in the college.
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