Census, Sample, Experiment, or Observation
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Census, Sample, Experiment, or Observation
Collecting data for Year 8: eight ways of collecting data, two of each, to name as a census, a sample, an experiment, or an observation, then five questions on why one technique suits better than another. With an answer key.
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Teach it first
Samples, Populations, and BiasA teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 2
- Last updated
- Time
- About 20 minutes
- Answer key
- Included
- Goes with
- Samples, Populations, and Bias
- Printing
- Black and white
- Related curriculum
-
Tell a random sample from a biased one, name random, systematic, stratified and convenience samples, see how much random samples of one size vary, use a sample to predict a count or a fraction of a whole population, and compare two populations from samples.
Reviewed by Mr. Robert Harrison, Teacher. How we check worksheets
How to use this sheet
- Have the child read the labels of every row and column, or both axes, before any question.
- Ask what the data is about and who it was collected from before drawing a conclusion.
- For scatter plots, have the child describe the trend in words before drawing a line.
Common mistakes
- Using the wrong total for a relative frequency: the row total, the column total or the whole table.
- Thinking a sample tells the exact answer for everyone. It gives an estimate.
- Thinking a pattern in a scatter plot proves that one thing causes the other.
