Samples of a cast aluminum part are classified on the basis of surface finish (i

Question

Samples of a cast aluminum part are classified on the basis of surface finish (in microinches) and length measurements. The results of 158 parts are summarized as follows

Problem 2.196 Your answer is partially correct. Try again. Samples of a cast aluminum part are classified on the basis of surface finish (in microinches) and length measurements. The results of 158 parts are summarized as follows: Length Excellent Good Excellent 71 16 Good 3 68 Surface Finish Let A denote the event that a sample has excellent surface finish, and let B denote the event that a sample has excellent length. Determine the following probabilities. Round your answers to four decimal places (e.g. 98.7654 5 RAnB) = T480 Are events A and B independent? No, A and B are not independent.

Explanation / Answer

P(A) = (71+16)/(71+16+3+68)

= 0.5506

P(B) = (71+3)/(71+16+3+68)

= 0.4684

P(AB) = 71/(71+16+3+68)

= 0.4494

No, A and B are not independent.

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