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Paolaemy Paolaemy
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6 years ago
A researcher selects his sample in this way. He paints numbers on 100 ping-pong balls, and he paints half of them blue and half of them green. He puts the blue half onto a large tray, and the green half of them onto another large tray.
 
  Then he mixes each group and trains his dog to bring 10 balls from each tray to him, gently and systematically, one at a time. What type of sample is this?
  a. Snowball
  b. Random
  c. Stratified random
  d. Systematic
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physicophysico
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Paolaemy Author
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Beauty
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