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Unformatted text preview: 1. INTUITIVE REASONING (Offered in class) In classical statistics, the goal is always to estimate parameter from sample. When one collects a sample with n observations, the sample will have n pieces of information (in stats, this is known as Degrees of Freedom). Once we calculate the sample mean and use it in other estimations (in our case, we use the sample mean in the estimation of standard deviation), we dont have n pieces of information anymore. Along with the sample mean, we have only n-1 pieces of information. That is why we use n-1 instead of n . Note: If you are happy with the above reasoning, you dont have to know the below reasoning. 2. ANALYTICAL REASONING Claim: the average of squared deviations from Sample mean the average squared deviations from Population mean i.e. [ ] [ ] i.e. the average of squared deviations from Sample mean underestimates the average of Squared deviations from Population mean. of Squared deviations from Population mean....
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- Spring '11