Ellen wants to see if the level of lighting in a room will affect the performance of individuals on an IQ test.One group in her study is placed in a room with very bright lights and a second group is placed in a room with more normal lighting.She finds that the individuals in the bright light group have better scores on the test than do the individuals in the normal light group.The difference between the two groups' scores is statistically significant,which means that the ____.

Question

Quizplus · Accepted Answer

The phrase "statistically significant" means that the observed difference in test scores between the two groups is unlikely to have occurred by chance, suggesting a real effect of lighting on performance.

Ellen Wants to See If the Level of Lighting in a Room