A quality control engineer at a potato chip company tests the bag filling machine by weighing bags of potato chips. Not every bag contains exactly the same weight. But if more than 15% of bags are over-filled then they stop production to fix the machine. They define overfilled to be more than 1 ounce above the weight on the package. The engineer weighs 100 bags and finds that 21 of them are over-filled. He plans to test the hypotheses H 0: p = 0.15 versus H a: p > 0.15. What is the test statistic? Group of answer choices Z = − 1.47 Z = − 1.47 Z = − 1.47 Z = − 1.47 Z = 4 Z = 4 Z = 4 Z = 4 Z = 1.68 Z = 1.68 Z = 1.68 Z = 1.68 Z = − 1.68 Z = − 1.68 Z = − 1.68 Z = − 1.68