Perspective of the federal bureau of investigation

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please read the Focus problem at the beginning of this chapter. Recall that Benford's Law claims that numbers chosen from very large data files tend to have "1" as the first nonzero digit disproportionately often. In fact, research has shown that if you randomly draw a number from a very large data file, the probability of getting a number with "1" as the leading digit is about 0.301 (see the reference in this chapter's Focus problem). Now suppose you are an auditor for a very large corporation. The revenue report involves millions of numbers in a large computer file. Let us say you took a random sample ofn= 216 numerical entries from the file andr=52 of the entries had a first nonzero digit of 1. Letprepresent the population proportion of all numbers in the corporate file that have a first nonzero digit of 1.

i. Test the claim thatpis less than 0.301. Use a = 0.05.

ii. If p is in fact less than 0.301, would it make you suspect that there are not enough numbers in the data file with leading 1's? Could this indicate that the books have been "cooked" by "pumping up" or inflating the numbers? Comment from the viewpoint of a stockholder. Comment from the perspective of the Federal Bureau of Investigation as it looks for money laundering in the form of false profits.

iii. Comment on the following statement: "If we reject the null hypothesis at level of significance a, we have not proved H₀to be false. We can say that the probability is a that we made a mistake in rejecting H₀." Based on the outcome of the test, would you recommend further investigation before accusing the company of fraud?

Reference no: EM131140357

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