A manufacturing company knows that their machines produce parts that are defective on occasion. They have 4 machines producing parts, and want to test if defective parts are dependent on the machine that produced it. They take a random sample of 321 parts and find the following results. Test at the 0.05 level of significance.

Defective

Machine 1: 10

Machine 2: 15

Machine 3: 16

Machine 4: 9

Non-Defective

Machine 1: 72

Machine 2: 75

Machine 3: 66

Machine 4: 58

Enter the test statistic - round to 4 decimal places.

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