A method of applying zinc plating to steel is supposed to produce a coating whose mean thickness
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A method of applying zinc plating to steel is supposed to produce a coating whose mean thickness is no greater than 7 microns. A quality inspector measures the thickness of 36 coated specimens and tests H0 : μ ≤ 7 versus H1 : μ > 7. She obtains a P-value of 0.40. Since P > 0.05, she concludes that the mean thickness is within the specification. Is this conclusion correct? Explain.
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