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In order to test a new scale a grocery store clerk weighs a 2 kilogram bag of fruit 100 times (Assuming grocery clerks are this meticulous). Using the Gauss model, and assuming no bias, the clerk estimates the SD of the error box to be 20 grams. Later that day, the store owner weighs the same bag of fruit on the new scale 10 times and finds the SD of the error box to be 35 grams. The SD of the error box that best reflects the likely size of chance error in a single measurement is:
  • 35 grams
  • 20 grams
  • 27.5 grams
  • 15 grams
  • 100 grams
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    Carlos Rodriguez <carlos@math.albany.edu>
    This problem was contributed by a student in Elementary Statistics. It is offered as it is with no warranty of any kind
    Last modified: Wed May 13 12:29:11 EDT 1998