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Mathematics, 06.05.2021 01:00 khalilh1206

The person diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters are normally distributed, with a mean of 0.7 inch and a standard deviation of 0.005 inch. After recalibrating the production machine, the manager randomly selects 26 pistons and determines the standard deviation is 0.0036 inch. Is there a significant evidence for the manager to conclude that the standard deviation has decreased

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The person diameter of a certain hand pump is 0.7 inch. The manager determines that the diameters ar...

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