Response of interest, observational unit, experimental unit
An Experimenter is planning to study the control of citrus blight. It is believed that a vector of this disease is the leafhopper. To control this pest, three new chemical sprays (A,B,C) are being considered. Each chemical spray will be applied in two amounts (low and high). A small grove containing five rows of six trees each is available for this study. Since this grove was once used as a demonstration project, each row of trees is on a different rootstock. There is a strong possibility of large differences between rootstocks. The experiment is carried out by selecting a row (rootstock) and then randomly assigning the treatments to the six trees. After a period of time, ten leaves are taken from each tree to measure citrus blight.
1)What is the response of interest?
2)List the factors of interest and whether they are categorical or continuous.
3)List the levels for the factors.
4)List out all possible treatment combinations
5)What is the experimental unit? What is the observational unit?