Research Tools

The Sample Size Calculator helps work out the minimum size of the sample, in other words the minimum number of respondents, to ensure that the results precisely reflect the target population. It should be noted, however, that the size of the sample is primarily necessary but not sufficient for representativeness.

Using the calculator

1. Select the confidence level. It reflects your desire to be sure of your results.
2. Enter the required margin of error. This reflects the confidence interval of the results. For example, when you enter the margin of error  value "3" , it means that, for example, 90% of the result of the survey can vary in the population within the range of 87-93%, but cannot go outside of this interval.
3. Enter the exact or approximate amount of population if you know  it.  If the population is very large or the size of the population is unknown, leave that box blank.
4. The resulting minimum sample size will be displayed.

The response accuracy or margin of error calculator helps assess the accuracy of the responses received by the survey.

Using the calculator

1. Enter the exact or approximate amount of population if you know it. If the population is very large or the size of the population is unknown, leave that box blank.
2. Select the confidence level. It reflects your desire to be sure of your results.
3. Enter the sample size
4. If you want to assess the accuracy of a specific response, enter the percentage (without % sign ) of the response received as a result of survey in the percentage box. If you want to calculate the accuracy for the entire survey, leave the response box (50) as it is. This outcome represents the maximum error for all of responses.
5. The result will be the margin of error.

With the compaund growth rate calculator, you can calculate the growth rate of your business or marketplace over a certain period of time.

1. Enter the sales figure at the beginning of the period
2. Enter the sales figure at the end of the period
3. The number of years elapsed during the period
4. The growth rate for that period will be reflected in the result