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Transcript

Experimental Data vs.

Observational Data

by Emily & Ida

Ida

Observational Data

Experimental Data

Emily

Experimental study

- researcher manipulates the variable and tries to determined how the manipulation influences the other variable

- there is human intervention

Citations

  • Notes

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/>.

  • It is used in science as a data produced by a measurement, test method and experimental design.
  • It may be qualitative or quantitative.
  • We are able to choose the values for some variables; hence you have manipulated, responding and controlled variable.

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=>.

Example :

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.

Example

How does the length of pendulum strings affects the number of swings per minute ?

Notes :

There is no experimental manipulation.

manipulated variable :

length of pendulum string (cm)

  • Definition

It is a data that is collected from an experimental study that involves taking measurements which can be manipulated

(temperature, velocity, mass, etc).

Observational Study :

There is no human intervention.

The researcher does not influenced the population in any way.

responding variable :

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.)

Definition :

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