# math

you want to survey students in ur school about their exercise habits.

a explain how you will survey a group of kids so ur data is unbaised.

b explain how u could survey a group of kids so ur data is baised.

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1. If you survey kids who play sports or work out in the weight room or other facility, what kind of answers do you think you will get?

Where could you survey a group of kids that would produce more typical results?

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2. i really don't have any idea about that.......plz help me...plz

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posted by malna
3. See my definition of random from your later post. How could every student have an equal chance of being in your sample?

I hope this helps. Thanks for asking.

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posted by PsyDAG
4. I should have stated -- If you survey ONLY the kids who play sports, etc., what do you think their responses would be about exercise habits?

Where can you find a cross-section of students?

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5. Biased surveys generate answers that are unrepresentative of the population about which you want to draw general conclusions. In this case, the population consists of all the students in your school. As Ms Sue says, what would you conclude if only you survey kids who work out in the weight room? You'd conclude that they all take a lot of exercise, yes? And you'd then want to apply those conclusions to the rest of the school. But suppose only 5% of the students in the school work out in the weight room, whereas the other 95% never go near the place. Wouldn't your conclusions paint a rather optimistic view of the exercising habits of the pupils in the school?

Suppose you were to carry out such a survey in the library. Would that be any better? Is there a possibility that you would now be biasing it in favour of the students who DON'T take much exercise? Or could you realistically assume that a student in the library is just as likely to take exercise as any other randomly-selected student in the school?

Now suppose you were to take a copy of the school register, and pick every tenth student in an alphabetical list of all the students in it. Would that solve your problem?

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posted by David Q
6. Thank you, David Q, for a complete and comprehensive answer.

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