Mathematics for IGCSE & O level - Categorical, Numerical And Grouped Data (Section 7 - No. 28)

Which of the following are key to make sure you do a survey correctly?

Make the questions are clear.

Choose a random sample.

Make all answers are correct

You have to change all the results.

To make sure your survey is correct, you need to make your questions clear, and you also need to choose a random sample