Home | About Us | Products & Services | Logon | Statistics Calculators | Directions | Links | Contact       Sample Size Calculator The Sample Size Calculator allows you to estimate the number of respondents you will need to interview to get precise results that reflect your target population/cell. Confidence Level(95% is standard) A reliability measure, a 95% confidence level means when a sample is drawn there are 95 chances out of 100 that the sample will reflect the true percentage of the population would lie within a given Margin of Error. Margin of Error The Margin of Error also known as Confidence Interval is the +/- number commonly reported in polls. E.g. ±3% Population(optional) The size of the population you are trying to represent. Leave blank if you’re not sure or don’t know what it is. Sample Size Needed :               Direction Research Group Ltd., has made every effort to ensure that the statistics calculators on this website operate correctly and that the results provided are accurate. However the calculators are provided as guides only and Direction Research Group Ltd., assumes no responsibility for omissions, errors, usage of calculators or interpretations made by visitors to this website. Direction Research Group Ltd.,recommends that you seek the advice of a statistician.   Other Calculators Difference in Proportions Test Means Calculator Response Rate Calculator Home | About Us | Products & Services | Logon | Statistics Calculators | Directions | Links | Contact | Privacy Policy   Copyright Direction Research Group Ltd. All Rights Reserved, 2005.