"A good way to engage students in mathematics and statistics is to start from a place that's familiar to them - their own lives and the lives of their friends," Ms Cunliffe said.
"Students love taking part in the activities and then, in class with their teachers, becoming 'data detectives' to see what stories are in the results - and not just in their own classroom, but across the country."
Students are being asked for the first time about food allergies to reflect the lack of data on the issue, says Ms Cunliffe.
"Students will be able to explore the dataset to compare the prevalence of self-reported allergies for different ages, ethnicities and sexes."
CensusAtSchool, now in its sixth edition, is a biennial collaborative project involving teachers, the University of Auckland's Department of Statistics, Statistics New Zealand and the Ministry of Education as part of an international effort to boost statistical capability among young people, carried out in Australia, the United Kingdom, Canada, the US, Japan and South Africa.