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Ontario Curriculum Expectation:
5.D1.1 explain the importance of various sampling techniques for collecting a sample of data that is representative of a population.
What is Bias?
It is important to collect data samples that can represent the population without bias.
Bias is when a survey does not equally or fairly represent the population.
For Example: Your teacher is asking the class what pizza they would like, but the teacher only asks 3 out of 24 students. The survey is biased.
To avoid bias a survey must be conducted fairly.
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1. Is the survey sample biased?
Ten citizens of a neighbourhood are asked if the city should provide recycling bins for all houses.CorrectIncorrect
2. Is the survey sample biased?
A university sends out a survey to 10% of their graduates ten years after their graduation to survey the salary and jobs of their graduates. The university makes sure graduates from different departments are included in the survey.CorrectIncorrect
3. Is the survey sample biased?
Anna purchased a 6 pack of muffins from every grocery store in her city to compare.CorrectIncorrect
4. Is the survey sample biased?
Manuel asked the boys in his class if the school should start a baseball league.CorrectIncorrect
5. Is the survey sample biased?
The local grocery store is trying to find whether the residents in the neighbourhood prefer their store over other chain grocery stores. They randomly interview customers shopping in their store and find out 90% of the customers prefer their store to other chain grocery stores.CorrectIncorrect
6. Is the survey sample biased?
Every fifth person entering the mall is asked to name their favourite store within the mall.CorrectIncorrect
7. Is the survey sample biased?
A city is planning to build a new arena and wants to ask for the opinions of the residents in the neighbourhood. The city council sends out surveys to different sports clubs and receive a very positive response of building a new arena.CorrectIncorrect
8. Is the survey sample biased?
Ten students from each grade are randomly selected to complete a survey about how they get to school.CorrectIncorrect
9. Is the survey sample biased?
A gym asks 15 of its members that are there in the afternoon if the gym should stay open overnight.CorrectIncorrect
10. Is the survey sample biased?
1000 people from each age group in the city are asked if they would like a new community center to open.CorrectIncorrect