Find a 95% confidence interval for the difference in the permeability coefficent between 60°C and 61°C.
The article “Permeability, Diffusion and Solubility of Gases” reported on a study of the effect of temperature and other factors on gas transport coefficients in semicrystalline polymers. The permeability coefficient 
of 
was measured for extruded medium-density polyethylene at both 60°C and 61°C. The results are as follows:
60°C: 54 51 61 67 57 69 60
60 63 62
61°C: 58 60 66 66 68 61 60
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