A quality control engineer is in charge of the manufacture of ...

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A quality control engineer is in charge of the manufacture of computer disks. Two different processes can be used to manufacture the disks. He suspects that the Kohler method produces a greater proportion of defects than the Russell method. He samples 150 of the Kohler and 200 of the Russell disks and finds that 27 and 18 of them, respectively, are defective. If Kohler is designated as Group 1 and Russell is designated as Group 2, which of the following tests will you use to find out if the Kohler method is worse than the Russell method?
 
  A) Z test for difference in proportions B) Paired t test
  C) McNemar test D) 2 test for difference in proportions

Question 2

A few years ago, Pepsi invited consumers to take the Pepsi Challenge. Consumers were asked to decide which of two sodas, Coke or Pepsi, they preferred in a blind taste test. Pepsi was interested in determining what factors played a role in people's taste preferences. One of the factors studied was the gender of the consumer. Data on the percentage of men and women depicting preference for Pepsi were collected. Which of the following tests will you use to find out if there is any difference in preference between the different gender groups?
 
  A) Z test for difference in proportions B) Wilcoxon rank sum test
  C) McNemar test D) Paired t test

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Answer to Question 1

A

Answer to Question 2

A