A machine is designed to manufacture bolts with a diameter of 15 mm. 23 bolts are examined, and it's found they have a mean diameter of 15.1 mm, with a standard deviation of .37 mm. To a 2.5% level of significance, can it be asserted that, in general, the standard deviation of the bolts is over .25 mm? [Assume that the bolt diameters are normally distributed.]

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
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A machine is designed to manufacture bolts with a diameter of 15 mm. 23 bolts are examined, and
it's found they have a mean diameter of 15.1 mm, with a standard deviation of .37 mm. To a 2.5%
level of significance, can it be asserted that, in general, the standard deviation of the bolts is over .25
mm?
[Assume that the bolt diameters are normally distributed.]
Transcribed Image Text:A machine is designed to manufacture bolts with a diameter of 15 mm. 23 bolts are examined, and it's found they have a mean diameter of 15.1 mm, with a standard deviation of .37 mm. To a 2.5% level of significance, can it be asserted that, in general, the standard deviation of the bolts is over .25 mm? [Assume that the bolt diameters are normally distributed.]
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