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Methodology summary
CLIENT: Television New Zealand.
RELEASED: Thursday 7 September 2017.
POLL CONDUCTED: Interviewing took place from Saturday 2 September – Wednesday 6 September
2017.
MEDIAN FIELDWORK DAY: Sunday (50% of sample size target was reached on this day).
TARGET POPULATION: Eligible New Zealand voters.
SAMPLE POPULATION: Eligible New Zealand voters who live in New Zealand households that have a landline
telephone.
SAMPLE SELECTION: Nationwide random digit dialling of landline telephones using stratified probability
sampling to ensure the sample includes the correct proportion of people in urban
and rural areas. Interviewers ask to speak to the person in each household aged 18
years or over with the next birthday. When required, multiple calls are made to
reach that person. Voting eligibility is determined at the first question.
SAMPLE SIZE: n = 1,007 eligible voters.
SAMPLING ERROR: The maximum sampling error is approximately ±3.1%-points at the 95% confidence
level. This is the sampling error for a result around 50%. Results higher and lower
than 50% have a smaller sampling error. For example, results around 10% and 5%
have sampling errors of approximately ±1.9%-points and ±1.4%-points, respectively,
at the 95% confidence level.
These sampling errors assume a simple random sample of 1,000 eligible voters.
INTERVIEW METHOD: Conducted by CATI (Computer Assisted Telephone Interviewing).
WEIGHTING: The data have been weighted to align with Statistics New Zealand population counts
for age, gender, household size and ethnic identification.
REPORTED FIGURES: Reported bases are unweighted. For Party Support, percentages have been rounded
up or down to whole numbers, except those less than 5%, which are reported to 1
decimal place. For all other figures percentages have been rounded up or down to
whole numbers except those less than 1%, which are reported to 1 decimal place.
All sub-group differences listed for supplementary questions are statistically
significant at the 95% confidence level.
METHODOLOGY NOTES: The party vote question has been asked unprompted since February 1997. |
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