Question: 3. Mechanical engineers testing a new arc welding technique, classified welds both with respect to appearance and an X-ray inspection Appearance Bad Normal X-ray

3. Mechanical engineers testing a new arc welding technique, classified welds both

3. Mechanical engineers testing a new arc welding technique, classified welds both with respect to appearance and an X-ray inspection Appearance Bad Normal X-ray Bad 20 7 Good 3 Normal 13 51 16 Good 7 12 21 Test for independence using 0.05 level of significance.

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