Solid copper produced by sintering (heating without melting) a powder under specified
Chapter 8, Problem 8.92(choose chapter or problem)
Solid copper produced by sintering (heating without melting) a powder under specified environmental conditions is then measured for porosity (the volume fraction due to voids) in a laboratory. A sample of n1 = 4 independent porosity measurements have mean y1 = .22 and variance s2 1 = .0010. A second laboratory repeats the same process on solid copper formed from an identical powder and gets n2 = 5 independent porosity measurements with y2 = .17 and s2 2 = .0020. Estimate the true difference between the population means(1 2) for these two laboratories, with confidence coefficient .95.
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