Question: An experiment to assess the effect of watering on the life span of a certain type of root system incorporates three watering regimens.
(a) How many populations involved in the study?
(b) The population(s) involved is (are) hypothetical: True or false?
(c) The variable of interest is qualitative: True or false?
(d) What is considered a treatment in this study?
(e) Suppose the experiment will be carried out in three different locations. It is known that specific location characteristics (e.g., temperature and soil conditions) also affect the life span of the root systems.
(i) Does this change the number of populations involved in the study?
(ii) List the factors involved in this experiment and their levels.