In conclusion randomized experiment as well as observational study
The makers of Frumpies the breakfast of rug rats," want to improve their marketing, so they consult you:
1) They first need to know what fraction of children, ages 10 to 13 and likes their celery-flavoured cereal. Explain what kind of study should they perform?
2) They are thinking of introducing a new flavour maple-marshmallow Frumpies as well as want to know whether children will prefer the new flavour to the old one. Plan a completely randomized experiment to investigate this question.
3) They suspicious that children who regularly watch the Saturday morning cartoon show starring Frump, the flying teenage warrior rabbit who eats Frumpies in every episode, may respond inversely to the new flavour. How would you take that into account in your design?