Question

Kidney failure patients are commonly treated on dialysis machines that filter toxic substances from the blood. The approximate dose for effective treatment depends on, among other things, duration of treatment and weight gains between treatments as a result of fluid buildup. To study the effects on the number of days hospitalized (attributable to the disease) during a year, a random sample of patients who had undergone dialysis treatment at a large dialysis facility was obtained. Treatment duration was categorized into two groups (short duration, long duration). Average weight gain between treatments during the year was categorized in three groups (slight, moderate, substantial).

(a) Is this study purely experimental or observation or mixture of both? Why?

(b) Identify all factors, factor levels, and factor-level combinations.

(c) What type of study design is being implemented here? (Look at the diagram

with the different kind of designs)

(d) What is the experimental unit of the study?

Answer 1