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Question 1
Which survey method should the girls use?

Select the first 15 tsunamis on the list and find the mean of the earthquake magnitudes.

Number the tsunamis. Use a random number generator to generate 15 numbers. Find the mean of the earthquake magnitudes for the fifteen tsunamis according to the numbers generated.

Arrange the tsunamis in order by earthquake magnitude. Select the top five, middle five and last five tsunamis listed, and find the mean of the earthquake magnitudes.

Answer: Incorrect; this method is biased. Not all tsunamis have an equal chance of being chosen. Try again. Correct! Go to question 2. Incorrect; this method is biased. Not all tsunamis have an equal chance of being chosen. It also favors the extremely high and extremely low magnitude tsunamis. Try again.