The correct answer is The mayor concludes that the towns unemployment rate is not 9% when it is in fact 9%.
An unemployed person is an individual who is part of the active population (who is of working age) and who is looking for a job, although without success. This situation translates into the impossibility of working and, that is, against the person's will.
I believe the answer is: double-blind experiment
In double blind experiments, the subjects that receive the treatment is remained unknown by both the researchers and the subjects until the experiment is finished. The main purpose of double-blind experiment it eliminate the bias of perception that might exist among researchers.
The answer is Seismoscope
I believe the answer is D.
Sorry is not right.
