They concluded that productivity increased due to attention that the workers got from the research team and not because of changes to the experimental variable.
From the en.wikipedia.org
If it makes experimental results more variable, more animals will need to be tested to ensure the outcome is statistically significant.
From the newscientist.com
Experimental methods involve the researcher altering a variable in the environment and measuring the effect on another variable.
From the en.wikipedia.org
What's more, SCHIP is a critical variable in the funding models shaping the development of experimental universal health care programs.
From the forbes.com
The experimental birds with FOXP2 knockdown drop syllables but they also have more variable syllables, which suggests that a different effect is happening.