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In a test of corrosion resistance, a sample of 62 Incoloy steel specimens were immersed in...

In a test of corrosion resistance, a sample of 62 Incoloy steel specimens were immersed in acidified brine for 4 hours, after which each specimen had developed a number of corrosive pits. The maximum pit depth was measured for each specimen. The mean depth was 850 μm with a standard deviation of 153 μm. The specification is that the population mean depth μ is less than 900 μm.

I got a P-Value of 0.0050.

The P-value calculated for testing H0 : μ ≥ 900 versus H1 : μ < 900 is a small probability; hence, it is plausible that the mean depth is greater than or equal to 900 μm.

Math   Statistics-And-Probability   
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