To make sure a poll reaches an accurate sample of people, we ensure that every one we want to represent has an equal chance of being selected and also ensure that the final sample spoken to represents the target population (adults of 18+ years, i.e. about ~50% of Nigerian population).
NOI Polls uses a proportionate, stratified sampling design to select respondents to be interviewed in order to obtain accurate polls. With random sampling, we use a list of randomly drawn telephone numbers and contact people on those telephone numbers. Stratification are also set on several key demographics such as survey location, age-group, gender to make sure the final sample is made up of exactly the same type of people in the population as a whole and to the same proportions.