Solid copper produced by sintering (heating without

Chapter 8, Problem 92E

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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 \(n_{1}=4\) independent porosity measurements have mean \(\bar{y}_{1}=.22\) and variance \(s_{1}^{2}=.0010\) A second laboratory repeats the same process on solid copper formed from an identical powder and gets \(n_{2}=5\) independent porosity measurements with \(\bar{y}_{2}=.17\) and \(s_{2}^{2}=.0020\). Estimate the true difference between the population means \(\left(\mu_{1}-\mu_{2}\right)\) for these two laboratories, with confidence coefficient .

Equation Transcription:

Text Transcription:

n_1=4

\bar y_1=.22

s1^2=.0010

n_2=5

\bar y_2=.17

s_2^2=.0020

(\mu 1- \mu 2)