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4. A new procedure for the determination of sulfur in coal was tested on a standard coal sample with a  certified value of 2.14% sulfur by mass. The new procedure gave results of 2.11%, 2.07%, 2.04%,  2.06%, and 2.16% for five separate determinations.  a) Does the new procedure give the correct result at the 95% confidence level?  b) Does the new procedure give the correct result at the 90% confidence level?

4. A new procedure for the determination of sulfur in coal was tested on a standard coal sample with a  certified value of 2.14% sulfur by mass. The new procedure gave results of 2.11%, 2.07%, 2.04%,  2.06%, and 2.16% for five separate determinations.  a) Does the new procedure give the correct result at the 95% confidence level?  b) Does the new procedure give the correct result at the 90% confidence level?

Chemistry for Engineering Students
Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter1: Introduction To Chemistry
Section: Chapter Questions
Problem 1.6PAE: Use the web to determine the differences in the amounts of aluminum recycled in states where there...
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4. A new procedure for the determination of sulfur in coal was tested on a standard coal sample with a 
certified value of 2.14% sulfur by mass. The new procedure gave results of 2.11%, 2.07%, 2.04%, 
2.06%, and 2.16% for five separate determinations. 


a) Does the new procedure give the correct result at the 95% confidence level? 


b) Does the new procedure give the correct result at the 90% confidence level? 

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