About Roy Morgan
Roy Morgan is the largest independent Australian research company, with offices throughout Australia, as well as in Indonesia, the United States and the United Kingdom. A full service research organisation specialising in omnibus and syndicated data, Roy Morgan has over 70 years’ experience in collecting objective, independent information on consumers.
Margin of Error
The margin of error to be allowed for in any estimate depends mainly on the number of interviews on which it is based. Margin of error gives indications of the likely range within which estimates would be 95% likely to fall, expressed as the number of percentage points above or below the actual estimate. Allowance for design effects (such as stratification and weighting) should be made as appropriate.
|
Sample Size |
Percentage Estimate |
|||
|
40%-60% |
25% or 75% |
10% or 90% |
5% or 95% |
|
|
1,000 |
±3.0 |
±2.7 |
±1.9 |
±1.3 |
|
5,000 |
±1.4 |
±1.2 |
±0.8 |
±0.6 |
|
7,500 |
±1.1 |
±1.0 |
±0.7 |
±0.5 |
|
10,000 |
±1.0 |
±0.9 |
±0.6 |
±0.4 |
|
20,000 |
±0.7 |
±0.6 |
±0.4 |
±0.3 |
|
50,000 |
±0.4 |
±0.4 |
±0.3 |
±0.2 |
