Which one of the following statement is not correct?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → A survey done using a sample of the population has no margin of error.
A sample is only a part of the population, so a value computed from it (a statistic) usually differs from the true population value (the parameter). This difference, the sampling error, is why every sample survey has a margin of error. So the statement in Option (3) is not correct.
Options (1), (2) and (4) are correct statements: a sample is drawn from the population, a measure computed from a sample is a statistic, and the sample is used to draw inferences about the population.