Five samples of a
ferrous-type substance were used to determine if there is a
difference between a laboratory chemical analysis and an X-ray
fluorescence analysis of the iron content. Each sample was split
into two subsamples and the two types of analysis were applied. The
table below shows the coded data of the iron content analysis.
Assuming that the populations are normal, test at the 0.05 level of
significance whether the two methods of analysis give, on the
average, the same result.
Sample
|
X-ray
|
Chemical
|
|
1
|
2.0
|
2.2
|
|
2
|
2.0
|
1.9
|
|
3
|
2.3
|
2.5
|
|
4
|
2.1
|
2.3
|
|
5
|
2.4
|
2.4
|
|
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