Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 6 - No. 11)
What are the two main things you must do for a survey?
Make sure all the answers are correct and choose a random sample.
Make sure that all questions are clear and ensure that the answers are correct.
Make sure that the questions are clear and ensure that the questions are correct.
Ensure that the questions are clear and choose a random sample.
Explanation
People, before you are using groups, make sure that all the questions are correct and that there are no overlaps. Also, make a random sample
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