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The true, unobserved population mean commute distance among all urban planners working in the Melbourne Metropolitan...

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Basic Math

  1. The true, unobserved population mean commute distance among allurban planners working in the Melbourne Metropolitan Area (?) is22km, with ?=15. You conduct a survey of 144 planners and find thatthe sample means commute distance (X-bar) is 25km (12 points).

  1. Describe two possible sources of bias that could have producedthis high estimate? (4 points)
  2. Is this sample mean impossible if no bias is introduced fromyour sampling process or survey questions? Why or why not? (4points)
  3. Presuming that no bias is introduced by your sampling andsurvey, what is the probability that you will draw this sample?Show your work. (4 points)

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