Two methods were used to study the latent heat of ice fusion. Both method A (an electrical method) and method B (a method of mixtures) were conducted with the specimens cooled to _0.72_C The data in the following table represent the change in total heat from 0.72°C to water at 0°C in calories per gram of mass.
Assuming normality, construct a 95% confidence interval for the difference between the means.
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