Collecting Data to Answer Questions (Grade 11 NSC Matric Mathematical Literacy): Flashcards
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Population (data collection)
Population (data collection)
Entire group you want to collect data about
Sample (data collection)
Sample (data collection)
Smaller subset chosen from population to represent whole
Survey
Survey
Process of collecting data from a sample or population
Bias in sampling
Bias in sampling
When sample doesn't accurately represent the population
Questionnaire
Questionnaire
Structured document with questions people complete themselves
Recording sheet
Recording sheet
Document researchers use to track events or behaviours over time
3 requirements for unbiased samples
3 requirements for unbiased samples
Representative, large enough, diverse
Why use samples instead of whole populations
Why use samples instead of whole populations
Practical reasons, cost, time constraints, accessibility
Consequences of biased samples
Consequences of biased samples
Skewed impression, wrong conclusions about population
Purpose of questions in statistical investigation
Purpose of questions in statistical investigation
Guide data collection, methods, organisation, & analysis