The two samples 70, 80, 30, 70, 60, 80 and 140, 120, 130, 120, 120, 130, 120
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The two samples 70, 80, 30, 70, 60, 80 and 140, 120, 130, 120, 120, 130, 120 are values of the differences of temperatures (°C) of iron at two stages of casting, taken from two different crucibles. Is the variance of the first population larger than that of the second? (Assume normality. Choose α = 5%).
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