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a sample of 50 lenses used in eyeglasses yields a sample mean thickness of 3.05 mm and a sample standard devia- tion of .34 mm. the desired true average thickness of such lenses is 3.20 mm. does the data strongly suggest that the true average thickness of such lenses is some- thing other than what is desired? test using a 5 .05.
Sagot :
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