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The piston diameter of a certain hand pump is 0.7 inch. The manger randomly selects 27 pristons and determines that the standard deviation is 0.0052

The piston diameter of a certain hand pump is 0.7 inch. The manger randomly selects 27 pristons and determines that the standard deviation is 0.0052 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the o=0.10 level of significance

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