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(Correct Answer) Math225 Week 2 Quiz While standing on a highway overpass, Jennifer wonders what proportion of the vehicles that pass on the highway below are trucks.

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QUESTION 9

While standing on a highway overpass, Jennifer wonders what proportion of the vehicles that pass on the highway below are trucks. The highway has 4 lanes running in each direction. Jennifer is only interested in the proportion of vehicles that pass over the course of the hour that she spends there. Which of the following sampling methods would be best for Jennifer to employ?

Select the correct answer below:

  • Obtain a cluster sample by randomly selecting 3 of the 36 numbers and letters that might be at the beginning of a license plate, and select every vehicle whose license plate starts with one of those 3 numbers or letters.
  • Obtain a convenience sample by watching 1 lane and selecting every vehicle that passes in that lane.
  • Obtain a systematic sample by selecting every 20th vehicle that passes (in any lane and going in any direction).
  • Obtain a stratified sample by, during every minute, spending 712 second watching each of the 8 lanes and selecting the last vehicle that passes during the time it is being watched (or the first vehicle after that time if no cars pass during that time).

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