he piston diameter of a certain hand pump is .5 inch.  The quality control manager determines the standard deviation is .004 inch.  The manager believes a recalibration will lower the variability.  After recalibration, 25 random pistons are checked from the production line and found to have a standard deviation of .0025 inch.  Was the recalibration effective?  Find the test statistic, χ2=χ2=_____________ (Use 3 decimals)

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