2.2 Read the brief report of some statistical research below, and a) explain why it is an experiment rather than an observational study
Antibiotics are commonly using to treat sinus infections. Alternatively a sterold solution
can be sprayed into the nose.
In a trial, 240 patients with a sinus infection were assigned to the treatments as follows:

The severity and length of the sinus infection was recorded for all patients.
Identify:
b) the factor(s) in the experiment and the number of levels for each
c) the number of treatments
d) the response variable(s) measured
e) whether it was blind, or double-blind
f) the nature and scope of the conclusion the experiment can reach