This worksheet will help you know how to determine the Sample Size. Sample size determination is closely related to statistical estimation. The sample size of a statistical sample is the number of observations that constitute it. It is typically denoted n, a positive integer.
**Sample Size formula**

Sample = Confidence Level/(Confidential Interval)^{2}

Sample Size = Sample/ [1 + ((sample -1) / P)]

Where

The value of confidential Level is,

90% = 0.680625

95% = 0.9604

99% = 1.664

**Sample Size Example**

Calculate the Sample Size whose Confidence Level is 90%, Confidential Interval is 35% & population is 95.

Substitute these values in the above formula we get,

Sample = Confidence Level/(Confidential Interval)^{2}

= 90%/(35%)^{2} [Substitute the value of Confidence Level]

= 0.680625 / (0.35)^{2}

= 5.5561

Sample Size = Sample/ [1 + ((sample - 1) / P)]

= 5.5561 / [1 + (5.5561 - 1)/90]

= 5.5561 / 1.05

= 5.2884

The above worksheet is a sample walk through to understand how to calculate sample size. When you try this calculation on your own, use this *sample size calculator* to verify your results.

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