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From the data sets of labor rates, we calculate the following statistics: East labor rate: Number of data points (n1)=6, Variance (S2x1)=$830.28 West labor rate:

From the data sets of labor rates, we calculate the following statistics:

East labor rate: Number of data points (n1)=6, Variance (S2x1)=$830.28

West labor rate: Number of data points (n2)=9, Variance (S2x2)=$440.59

What is the pooled standard deviation (Sx1x2) of the East versus West labor rates?

A-$24.30

B-$16.35

C-$28.81

D-$20.99

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