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Sample size determination or estimation is the act of choosing the number of observations or replicates to include in a statistical sample. The sample size is an important feature of any empirical study in which the goal is to make inferences about a population from a sample. In practice, the sample size used in a study is usually determined ...
In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be bought ...
Pearson's correlation coefficient, when applied to a population, is commonly represented by the Greek letter ρ (rho) and may be referred to as the population correlation coefficient or the population Pearson correlation coefficient. Given a pair of random variables (for example, Height and Weight), the formula for ρ [10] is [11] where.
The weighted arithmetic mean is similar to an ordinary arithmetic mean (the most common type of average ), except that instead of each of the data points contributing equally to the final average, some data points contribute more than others. The notion of weighted mean plays a role in descriptive statistics and also occurs in a more general ...
where p is the total number of explanatory variables in the model, and n is the sample size. The adjusted R 2 can be negative, and its value will always be less than or equal to that of R 2 . Unlike R 2 , the adjusted R 2 increases only when the increase in R 2 (due to the inclusion of a new explanatory variable) is more than one would expect ...
Get a free sample of Kotex pads when you share your name, address, e-mail, sex, and date of birth. You'll also need to answer three questions about your use of pads. You can opt in or out of the ...
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