So how do we actually decide whether the difference is large enough? We use statistical tests to calculate a p-value (probability) for the difference between the two groups we are comparing. In the beetle food preference experiment from above, it was found that beetles spend longer times with food #1 compared to food #2, and the p value for this difference was calculated to be 0.9. What does a p value of 0.9 mean here? There's a 9 (nine) % chance that the difference is due to actual beetle preference of food #1 over food #2.   There's a 90% chance that the difference is due to chance, and not actual beetle preference of food #1 over food #2.   There's a 90% chance that the difference is due to actual beetle preference of food #1 over food #2.   There's a 9 (nine) % chance that the difference is due to chance, and not actual beetle preference of food

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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So how do we actually decide whether the difference is large enough? We use statistical tests to calculate a p-value (probability) for the difference between the two groups we are comparing.

In the beetle food preference experiment from above, it was found that beetles spend longer times with food #1 compared to food #2, and the p value for this difference was calculated to be 0.9. What does a p value of 0.9 mean here?


There's a 9 (nine) % chance that the difference is due to actual beetle preference of food #1 over food #2.
 
There's a 90% chance that the difference is due to chance, and not actual beetle preference of food #1 over food #2.
 
There's a 90% chance that the difference is due to actual beetle preference of food #1 over food #2.
 
There's a 9 (nine) % chance that the difference is due to chance, and not actual beetle preference of food #1 over food #2.
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