Question

An established method for quality control analysis at the Bayer Plant has been challenged by a recently hired chemist. The new chemist claims to have a method that gives an improved precision over the established method.

Sample	Established Method	New Method
	( mg aspirin )	( mg aspirin )
1	254	250
2	249	249
3	252	250
4	252	249
5	249	251
6	249	251
7	250	249
8	247	250
9	251	251
10	252	249

A) Do the two methods give the same answer within experimental error at the 95% confidence level?

B) Are the standard deviations of the two methods different at the 95% confidence level? Yes or No

Answer 1