Test whether the mean wall thickness exceeds
The wall thickness of 25 glass 2-liter bottles was measured by a quality-control engineer. The sample mean was 4.058 mm, and the sample standard deviation was 0.081 mm. At 5% significance level, test whether the mean wall thickness exceeds 4.0 mm.
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The sample mean was 4.058 mm, and the sample standard deviation was 0.081 mm. At 5% significance level, test whether the mean wall thickness exceeds 4.0 mm.
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