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Randomisation in probability
ok so i have an assignment about stats-probability.A. one of the questions ask me why do we need randomisation in the probality invatigation we did and to mention possible bias.
the investigation was to determine how many red and yellow plastic teddy bear toys were in the black bay. altogether there are 11 teddies and we pulled out one teddy and recorded the colour of that teddy on a tally chart.we did this 140times.
B. another question was why we preselected to pull out the teddybears 140 times out of the bag and to mention possible sources of bias. i answered this and said that it was so it was fair because if you leave the test open ended then you would keep going to get the answer you want.
can anyone add to this at all?
i tried to research it but there wasnt much info, anyway thank you for any answers given
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On part B you are half right, 'you need a percentage rate and a margin of error. Although 140 is hard to convert to 100 at first site, every 14 would equal 10% of the sample. Randomisation is important even here so as to demonstrate that as with humans not every plastic bear is going to be green.'
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