WEST-E Biology (NES 305) Practice Questions - NES Biology (305) For Washington Educator Endorsement Exam

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A class tests the effect of light intensity on photosynthesis using 20 leaf disks at each light level instead of only 2. What is the best reason for using the larger sample size?

It changes the dependent variable into an independent variable. It eliminates the need to keep temperature constant. It reduces the influence of individual variation among leaf disks. It proves that light intensity is the only factor affecting photosynthesis.

Correct Answer:

It reduces the influence of individual variation among leaf disks.

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