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How many people were asked, and is this enough?
How many people were asked, and is this enough?
The sample size is often denoted the letter N. If a report lists various values of N, then these are for the subgroups mentioned.
The larger the sample size, the more reliable the statistics the survey gets will be.
For political polls, with a few simple questions, the sample size is usually around 1000 respondents.
For more complicated surveys, a statistician might decide to survey fewer people, due to cost or time constraints.
The size of each subgroup being considered needs to be reasonable too. If a survey is investigating responses by age groups and ethnicity, then although a sample of 1000 at first seems reasonable - but only 20 or so of these people would be Māori and over the age 65. These 20 people are not a large enough group to make conclusions about all Māori over the age of 65.
New Zealanders are stressed out about what to eat, survey says
28 Oct 2018, Kirsty Lawrence, stuff.co.nz (article link)New Zealanders are stressed out about what to eat, survey says
A new survey shows Manawatū residents feel overweight, stressed about what to eat and think healthy food is too expensive.
The survey, commissioned by Nutribullet Balance, investigated just over 1000 Taranaki, Whanganui and Manawatū residents' attitudes towards food, dietary habits and barriers to healthy eating.
It showed one in three people believed they needed to lose more than 15 kilograms to be healthy and in the past year, seven out of 10 people had been on some kind of diet.
More than half said they would eat more healthily if it was easier and more than a third said they were often stressed and confused about what they should be eating.
Central Primary Health Organisation clinical dietitian Suzanne Aitken said one of the biggest things she heard about was the financial implications of eating healthy.
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Focus Questions
Focus Questions
- What was the sample size?
- What is the size of any subgroups discussed?
Possible Answers
Possible Answers
The sample size was at least 1000 people, which is a good number to be surveyed and would give a good estimate of the population measures.
The size of the subgroups (the three regions described) have not been given, but Whanganui is the smallest of these regions. If other results in the report were separated by region, we could have less confidence in their significance.
Task 6
Task 6
Answer the Sample size focus questions about the Salt report:
- What was the sample size?
- What is the size of any subgroups discussed?
Report-Salt.pdfGoogle Sites
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