Wednesday, November 17, 2010

Number of samples from a population

4. Now your mum wants in on the fun. She collected only eleven candies. How many possible samples of size four could she get from her collection?

Note that N is the notation for size of population and n is the notation for the sample. So in this case, N = 11 and n = 4. The working is below. Use the ! key on your calculator to get the numbers. The symbol ! means ‘factorial’, an instruction to multiply out all the numbers down to 1. So 4! = 4 * 3 * 2 *1 = 24

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