An auditor detects that a firm is regularly overstating the amounts of inventories because of delays in recording withdrawals. He takes a random sample of 20 inventories and finds that they are overstated by the following amounts (in pounds sterling)
10 12 9 28 6 20 26 24 12 22 5 14 11 23 9 21 29 13 16 24
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(d) Calculate the sample mean and the sample median, and compare these two values. Which of these two values is more ‘informative’?
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(e) Calculate the range and the interquartile range of the data.
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(f) Calculate the sample variance, the sample standard deviation and the coefficient of variation.
