15. Paul wants to grow as many vegetables as he can on his small garden plot. He

Question

15. Paul wants to grow as many vegetables as he can on his small garden plot. He divides his garden into four wock. On the second piece he uses equally sized pieces. On the first piece, he uses fertilizer and waters once a no fertilizer but waters twice a week. On the third, he waters once a week with no piece he uses fertilizer and waters twice a week. Then he vegetables. What are the experimental umits? What are the factoes? What are the levels? What is the fertiliner, and on the fourth sees which piece of his garden produces the most variable? 16. In an esperiment, why are the individuals assigned randomly to the different treatment groups?

Explanation / Answer

15. The experimental unit is the physical entity which can be assigned, at random, to a treatment. Commonly it is an individual animal. The experimental unit is also theunit of statistical analysis. However, any twoexperimental units must be capable of receiving different treatments. Hence here 4 pieces of garden are experimental units.

A factor of an experiment is a controlled independent variable; a variable whoselevels are set by the experimenter. A factor is a general type or category of treatments. Different treatments constitute different levels of a factor. Water and fertilizer are factors.

Different level of factors is called levels. So the way fertilizers and water used in difference pieces are level.

The response variable is the focus of a question in a study or experiment. So vegetables are response variable.

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