Mathematics, 14.07.2019 08:00 anthonysquadjohnson
The piston diameter of a certain hand pump is 0.6 inch. the manager determines that the diameters are normally distributed, with a mean of 0.6 inch and a standard deviation of 0.003 inch. after recalibrating the production machine, the manager randomly selects 26 pistons and determines that the standard deviation is 0.0026 inch. is there significant evidence for the manager to conclude that the standard deviation has decreased at the alpha equals 0.10 level of significance?
Answers: 1
for 25 degrees of freedom at 10% level = 34.382. 
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The piston diameter of a certain hand pump is 0.6 inch. the manager determines that the diameters ar...
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