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Category Archives: Statistical Inference
Which Car Rental Company Is More Expensive, Budget or Avis?
Any “budget” conscious consumer/traveler would want to find a good deal wherever and whenever he or she can, especially when it comes to airfare and rental cars. In tough economic times, bargain hunting is the norm rather the exception. This … Continue reading
Posted in Sampling Distributions, Statistical Inference, Statistics
Tagged Alternative Hypothesis, Confidence Interval, Descriptive statistics, Introduction to statistics, Introductory statistics, Matched Pairs ttest, Null Hypothesis, OneSample tProcedures, OneSample ttest, pvalue, Statistical Inference, ttest
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Benfordâ€™s Law and US Census Data, Part II
The Benford’s law is a probability model that is a powerful tool for detecting frauds and data irregularity. The first digit (or leading digit) of a number is the leftmost digit and can only be 1, 2, 3, 4, 5, … Continue reading
Posted in Probability, Statistical Inference, Statistics
Tagged Alternative Hypothesis, Benford's Law, Chisquare goodness of fit, Chisquare statistic, Chisquare test, Introduction to statistics, Introductory statistics, Null Hypothesis, pvalue, Statistical Inference, Tests of Significance
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Benford’s Law and US Census Data, Part I
The first digit (or leading digit) of a number is the leftmost digit (e.g. the first digit of 567 is 5). The first digit of a number can only be 1, 2, 3, 4, 5, 6, 7, 8, and 9 … Continue reading
Is It Possible to Spot Fraudulent Numbers?
People engage in financial frauds have a need to produce false data as part of their criminal activities. Is it possible to look at the false data and determine they are not real? A probability model known as the Benford’s … Continue reading
Presidential Elections and Statistical Inference
We use an example of presidential elections to illustrate the reasoning process of statistical inference. The current holder of a political office is called an incumbent. Does being an incumbent give an edge for reelection? The answer seems to be … Continue reading
A Case of Restaurant Arson and the Reasoning of Statistical Inference
I know of a case of a restaruant owner who was convicted for burning down his restaurant for the purpose of collecting insurance money. It turns out that this case is a good example for introducing the reasoning process of … Continue reading