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Exercise #4

Quality control problem:

According to U.S. News & World Report, a laboratory in Atlanta is processing snake venom for use in medical research. Five processing methods are being tested to determine which is least likely to contaminate the processed venom. If a venom solution is tested as contaminated, it is marked with symbol “2B”. Each method produces 25 vials of venom each day. The vials from each processing method are then boxed for shipment to medical research facilities.
Assume for our purposes that scientists in the laboratory feel that the contamination is uniformly distributed, but others argue that it is not.

Conduct each test and state a conclusion using a significance level of 0.05.

processing method Observed

1 34
2 17
3 14
4 12
5 23

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