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What is n in statistics?

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The symbol n in statistics generally refers to the number of observations in the data. The capital letter N refers to the number of observations in the entire population whereas the letter n denotes the number of observations in the sample drawn from the population.

Example:

Suppose that the population of the city is 10000 people. We draw a sample of size 1000 in order to estimate the average height of people in the city.

Here N = 10000 = Size of the population

and n = 1000 = size of the sample drawn in order to study the population

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