CALCULATE STATISTICAL VALIDITY FOR YOUR SURVEY

Determining statistical validity is easy with the VGI StatCalculator.

CLICK HERE TO ACCESS THE CALCULATOR.

Fill in any three variables, and the calculator will tell you the fourth.

 Read our blog article about sampling

DEFINITIONS

Sampling error

• The error caused by the selection of a sample instead of conducting a census of the entire population.

Population or universe

• The entire group about whom you are trying to get information.

Confidence level

• Statistical likelihood or probability that the answer you get lies within the confidence interval of an estimate.

Sample size

• The number of objects in the sample.

EXAMPLE

If you randomly interview a sample of 383 respondents from a population of 100,000, 95 times out of 100 (95% confidence level) the answer will be within 5% in either direction of reality (sampling error).

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