||Ott and Longnecker, Chapter 15, pages 829-852.
This is a short chapter but don't be fooled. There is a lot of important
concepts introduced here. Pay attention to the following:
- The difference between observation and experimental studies.
- The difference between the two methods of controlling crucial factors
- The list of items that should be included in a experimental plan.
- The definition of treatment and factor. Can you give examples from
your field of study at to what is a factor and what is a treatment?
- Can you give an example of a factorial set of treatments?
- What is a control treatment and why is it important in most experimental
- What is an experimental unit? How is it different from the measurement
- What do we mean by replication of a treatment in an experiment?
- Is "experimental error" really a mistake?
- What is the important role of the measurement of the variance of
the experimental error (OK - I prefer to use the term residual)?
- What do we mean when we talk about "control"?
- What is a block, and why is it an important tool in experimental
- What is a covariate?
- Does it make a difference if we talk about randomizing treatments
to experimental units or randomly assigning experimental units to
- Do you understand how to do this randomization?
- What is the difference in randomization between a completely randomized
design and a randomized complete block design?
- If I have more experimental units in a block than I have treatments,
what do I do about randomization?(see page 844)
- Do you understand how to use the equation for number of replicates
on page 845?
Answers to all these questions are in this chapter.
||Experimental Design Notes included in Unit 5 Section 2 lecture
slides on Randomized Complete Block Design.
||To check your understanding of the readings and practice
these concepts and methods, go to Unit
5 Section 1 Exercises, do the exercises then check your answers from
the page provided. Following this continue on to the Unit
5 Section 2.