Methodology as listed on page 2 of the report:
βJournalists from all known media organisations were sent an email invitation to an online survey.β
βApproximately 1200 invitations were sent. Of these, 359 completed the full survey, a response rate of 29.9%.β
βWe estimate we have a confidence interval of 4.56% at the 95% confidence level, giving a margin of error of + or β 2.25%.β
βWe base this on an estimated population of 1600 full-time print (inc online) and broadcast journalists.β
βThis is the population as recorded in the most recent NZ Government census (2018), which recorded approximately 1200 print and 400 broadcast journalists.β
Under the methodology given on how they reached these findings, 359 out of 1200 invitations have participated, so out of the 29.9% the rest is just guesstimates. Then goes on to say itβs based on 1600 full time print and broadcast journalists from the 2018 census. Sounds like a kids homework project