Observation study or experiment

Question

EX 6) Observation study or experiment

1) In a clinical trial of the cholesterol drug Lipitor, 188 subjects were given 20-mg doses of the drug, and 3.7% of them experienced nausea

2) In a study sponsored by Coca-Cola 12,500 people were asked contributes most to their happiness, and 77% of the respondents said that it was their family or partner.

Answer 1

Ex 6)

1)

It is an experiment. Subjects are given a treatment and results observed.

In an experiment investigators apply treatments to expermental units (people, animals ,plots of land etc) and then proceed to observe the effect of the treatments on the experimental units.

In this case the researchers have manipulated on the cholesterol drug Lipitor.

Experiment is performed and it is observed that 3.7% of them experienced nausea.

 

2)

It is an observational study.

In an observational study investigators observe subjects and measure variables of intrest with out assigning treatments to the subjects.The treatment that each subject receives is determined beyond the control of the investigator.

In this case, a survey that whether Coca-Cola contributes more happiness was made on 12,500 people and their response was observed.