A farmer is concerned that a change in fertilizer to an organic variant might change his crop yield. He subdivides his six lots and uses the old fertilizer on one half of each lot and the new fertilizer on the other half. The following table shows the results. Crop Yield Using Old Crop Yield Using New Lot Fertilizer Fertilizer 1 10 12 2 13 12 12 12 4 9 12 5 11 9 6 Assume the crop yields are normally distributed. Which of the following is the correct value of test statistic?

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