New York State Chemistry RegentsNew York State Earth Science Regents

 
Living Environment Regents June 2010 Question 33 PDF Print E-mail
Thursday, 26 May 2011 16:09
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Correct answer: (4) test a third group that does not receive the supplement

For experiments like this, it is important to have a control setup, wherein a variable must remain unchanged or held constant to prevent its effects on the outcome and thus verifies the behavior of and the relationship between independent and dependent variables. In this particular experiment, it could have been easier to measure the efficacy of the mineral supplement if a control setup was present by simply comparing the health conditions of the control and those that took up mineral supplements in two different dosages.

Incorrect answers:

(1) test only one group with 200mg of the supplement

Control setups are important to test the validity of the results. Thus, only one setup will leave the researchers with no point of comparison with other factors that could have affected the results of the experiment.

(2) test the supplement on both groups for 5 weeks instead of 10 weeks

Decreasing the time period of the experiment to 5 weeks could lead to invalid results because the time frame is too short.

(3) test a third group that receives 150mg of the supplement

This is irrelevant because both 100mg and 200mg produced the same results.
 

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