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POPSRepairPal: Yes, your mechanic is ripping you off To drive home his point, Sturtz told me about a study the company did when it was forming: 50 calls were made to shops asking for a price quote on a given repair. Then, a short time later, the calls were made again to the same shops, but this time with women making the queries instead of men. The average price difference was 17 percent higher when women called.
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POPSHow a statistical formula ((M-1)(S+1)/S) won the war "The basic idea was that the highest serial number among the captured tanks could be used to calculate the overall total. The German tanks were numbered as follows: 1, 2, 3 ... N, where N was the desired total number of tanks produced. Imagine that they had captured five tanks, with serial numbers 20, 31, 43, 78 and 92. They now had a sample of five, with a maximum serial number of 92. Call the sample size S and the maximum serial number M. After some experimentation with other series, the statisticians reckoned that a good estimator of the number of tanks would probably be provided by the simple equation (M-1)(S+1)/S. In the example given, this translates to (92-1)(5+1)/5, which is equal to 109.2. Therefore the estimate of tanks produced at that time would be 109."
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