It would be nice if you could help me with this question. The wall thickness of

Question

It would be nice if you could help me with this question. The wall thickness of 25 glass 2-liter bottles was measured bya quality-control engineer. The sample mean was x = 4.05millimeters, and the sample standard deviation was s =0.08 millimeter. Find a 95% lower confidence bound for mean wallthickness. Interpret the interval you have obtained. The wall thickness of 25 glass 2-liter bottles was measured bya quality-control engineer. The sample mean was x = 4.05millimeters, and the sample standard deviation was s =0.08 millimeter. Find a 95% lower confidence bound for mean wallthickness. Interpret the interval you have obtained.

Explanation / Answer

=0.05, Z(0.05)=1.645 (check normal table) The 95% lower confidence bound is x-bar - 1.645*s/n = 4.05 -1.645*0.08/25 = 4.024

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