Question: Suppose you want to investigate the likely demand for a new flavour of ice-cream called lollipop Special. Discuss the possible biases (if any) in the following proposed sampling techniques:

1. Ask all the children in a certain school whether they would buy an ice-cream called lollipop Special.
2. Give all the children in the school a sample of lollipop Special, and then ask them whether they like it.
3. Go to suburban shopping centres on a Saturday morning, randomly give out free samples of lollipop Special, and see whether people then buy the product from the supermarket.
4. 60 to a cricket Test match, sell lollipop Special 10 cents cheaper than the other ice-creams, and see whether people buy it. Can you propose any better method than the above suggestions?

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