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A quality control engineer want to know whether washers used in a certain application are supposed to have a mean thickness of 2 mm or

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A quality control engineer want to know whether washers used in a certain application are supposed to have a mean thickness of 2 mm or not. (Two-sided test) a) State the null and alternative hypothesis: H0 :IJ' [Select] v Ha: H [Select] v b) State the parameter of interest: [ Select ] v

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