Distinguish between a population and a sample and investigate techniques for collecting data, including census, sampling and observation (VCMSP297)
LO: To investigate different techniques for collecting data.
Know:

What the definition of census is and what is the advantage over sampling.

What the definition of sampling is and what is the advantage over census.

What the definition observation is.
Understand:

That there are different ways of collecting data, each with their positives and negatives.
Do:

I can use different survey techniques to collect data.
Elaborations

identifying situations where data can be collected by census and those where a sample is appropriate

investigating the differences between convenience, judgemental and simple random sampling from a population
Visual Representations
Teaching Notes
There are 2 general techniques for collecting data, Census and Sampling.
Census – a census is when you collect data for every member of the group from the data set.
Sampling (sample) – a sample is when you collect data for a selected members of the group.
Positives and Negatives

Positives 
Negatives 
Census 
+ More accurate because you have to survey everyone 
– Takes a lot of time to survey everyone 
Sampling 
+ Much quicker to survey a select few rather than the whole population 
– Less accurate as the sample might not be representative of the whole. 
Sampling (sample) – a sample is when you collect data for a selected members of the group.
Positives and Negatives
Teaching Ideas

explain the relationship between a census, a representative sample, sample size, and a population (e.g.,“I think that in most cases a larger sample size will be more representative of the entire population.”
Collecting Data Videos
Practise Questions
Year 8 Big Ideas
Exercise 9A pg. 313 Now Try These: Q. 13
My Maths 8
Exercise 9A pg. 459 Q. 115