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13 cards from this deck
The complete group being studied
Smaller group selected from the population
Make predictions about the whole population
Every member has equal chance of being selected
Cost-effective, time-saving, easier analysis
Sample doesn't properly represent the population
Sample too small
Non-random selection or limited representation
Larger sample, random sampling, include different groups
Write names on paper, put in hat, draw randomly
Assign numbers, use computer to generate random selection
Small samples are less reliable
Calculate the sample mean
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