An investigation wants to describe all residents of the town. It surveys 20 of the 390 residents. Which group is the sample?
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Answer: The 20 surveyed residents
The sample is the subset actually surveyed: 20 residents.
The population is the full group the investigation wants to describe.
Example 2
Researchers collect one response from each of 50 players at a sports club, where the target population contains 400 players. No one is counted twice. Is this a census or a sample survey?
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Answer: A sample survey
Only 50 of the 400 members are included
this is a sample survey.
Example 3
For each student, an investigator records number of pets. What type of variable is this?
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Answer: Discrete numerical
The number of pets is a whole-number count.
Populations, samples and variable types practice | Year 8 | Ascent Arcade