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Which of the following statements best reflects the results of an experiment?  they...

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r-m-r | Student, Undergraduate | (Level 1) Honors

Posted September 22, 2012 at 4:57 AM via web

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Which of the following statements best reflects the results of an experiment?

 

they have high reliability and high validity

they have high relability and low validity

they have low rleabilty and high valdity 

they have low relibaity and low validity

 

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litteacher8 | Middle School Teacher | (Level 1) Distinguished Educator

Posted October 2, 2012 at 5:26 PM (Answer #1)

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If you design an experiment well, it should have high reliability and high validity.

Reliability means that the experiment’s results can be replicated.

 If you follow a set procedure, you should get the same results every time.  If your experiment is well designed enough to control all variables, you should be able to replicate your results, and so should anyone else who follows your procedures.  Part of the procedure involves identifying and controlling variables.

Validity means that your results are meaningful. 

Basically, if your experiment is valid it is measuring what it is supposed to be measuring.  Your experiment might be very reliable, and get the same results every time, but that does not mean it’s valid.  Consider a tabloid newspaper.  It may be reliable in that it always has crazy and unbelievable stories.  That doesn’t mean it’s valid, because the stories are not likely true.

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