Measurements are made on the lengths, in mm, of a sample of twenty wooden components for selfassembly furniture. Assume that these may be regarded as twenty independent observations from a normal distribution with unknown mean μ and unknown variance σ^2. The data are as follows.581580581577580581577579579578581583577578582581582580582579 Find a 80 % confidence interval for the variance σ^2

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Measuring length and width of objects