Apply Fisher’s LSD method to the superconducting material experiment An article in theMaterials Research Bulletin investigated four different methods of preparing the superconducting compound PbMo6S8. The authors contend that the presence of oxygen during the preparation process affects the material’s superconducting transition temperatureTc. Preparation methods 1 and 2 use techniques that are designed to eliminate the presence of oxygen, while methods 3 and 4 allow oxygen to be present. Five observations onTc(in °K) were made for each method, and the results are as follows:
Preparation Method
Transition Temperature Tc(°K)
1
14.8
14.7
14.9
2
14.6
15.0
3
12.7
11.6
12.4
12.1
4
14.2
14.4
12.2
11.7
Which preparation methods differ, if α = 0.05?
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