Table 5.10 contains information on the mean duration of customer service calls between a training and a test data set. Test whether the partition is valid for this variable, using α = 0.10.

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Data set Sample Mean Training = 20.5 set Test set ₂= 20.4 Sample Standard Deviation S₁ = 5.2 $₂4.9 Sample Size 1₁ = 2000 n₂ = 600