How to Determine Required Sample Size? - Tutorial

How to Determine Required Sample Size? - Formula, Example

Description:

Sample size determination is the act of choosing the number of observations or replicates to include in a statistical sample.

Formula:

n = (2K2-1)/(K2-1) + pK2 / (K2-1)
Where,

n - Required sample size, k - Inflation Factor, p - Number of predictors,

Example:

The average Internet usage of households in one week has a random sample of 205 business plan and with an Inflation Factor of 1.01. Calculate the maximum number of samples to determine the internet usage of households.

Solution :

Given,

Inflation Factor = 1.01 number of predictors = 205

To Find

Minimum number of samples (n).

Substitute the given values in the formula:

n = (2K2-1)/(K2-1) + pk2 / (k2-1) n = (2(1.01)2-1)/((1.01)2-1) + p(1.01)2 / ((1.01)2-1) n = 51.75 + 50.75 P n = 51.75 + 50.75 (205) n = 10455.76

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