A rehabilitation center researcher was interested in examining the relationship

Question

A rehabilitation center researcher was interested in examining the relationship between physical fitness prior to surgery of persons undergoing corrective knee surgery and the time required in physical therapy until successful rehabilitation.Data on the number of days required for successful completion of physical therapy and the prior physical fitness status (below average, average, above average) were collected. (a) Is this study experimental, observational or mixed? Why? (b) Identify all factors, factor levels, and factor-level combinations. (c) What type of study design is being implemented here? (d) What is the basic unit of study?

Explanation / Answer

a)

This is a Observational study

b)

The factors during an experiment in order to determine their effect on the response variable. Factors can only assume a limited number of possible values, known as factor levels. Factors can be a categorical variable or based on a continuous variable but only use a few controlled values in the experiment.

The number of days for recovery depend on the fitness status

c)

ANOVA One way classification

d)

The average recovery time is the same for all fitness statuses

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