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- researcher manipulates the variable and tries to determined how the manipulation influences the other variable
- there is human intervention
Roberts,Donna. "Statistical Studies." regentsprep.Oswego City School District Regents Exam Prep Center.Web.
28 July 2013
<www.regentsprep.org/Regents/math/algtrig/ATS1/StatSurveylesson.htm>
"Experimental vs.Observational Studies." Experiments vs.Observational Studies. N.p.. Web. 27 Jul 2013.
<www.public.iastate.edu>.
Prabhat. "Difference Between Observational Study and Experiments." DifferenceBetween.net. May 2, 2011
<http://www.differencebetween.net/science/difference-between-observational-study-and-experiments/>.
Kharuffa, Hiba. "What is the difference between Observational and experimental study?." Answers.
Answers Corporation, 2013. Web. 27 July 2013.
<http://wiki.answers.com/Q/What_is_the_difference_between_Observational_and_experimental_study>.
Smith, Gary. Essential Statistics, Regression, and Econometrics. London: Elsevier Inc., 2012. 152.Web. 26 July 2013.
<http://my.safaribooksonline.com/book/-/9780123822215/chapter-5dotsampling/55_observational_data_versus_e#X2ludGVybmFsX0J2ZGVwRmxhc2hSZWFkZXIeG1saWQ9OTc4MDEyMzgyMjIxNS8xNTI=>.
A group of students is interested to know whether attending OSSLT extra class frequently and score high marks in OSSLT.The students use a survey collect their data from both students who went for the OSSLT extra class frequently and those who did not go.
There is no experimental manipulation.
length of pendulum string (cm)
It is a data that is collected from an experimental study that involves taking measurements which can be manipulated
(temperature, velocity, mass, etc).
There is no human intervention.
The researcher does not influenced the population in any way.
the number of swings per minute
Its an observational study which they observe people in different circumstances over which the researcher has no control.
(number of children,people who are jobless and etc.)