Look at the following research article to see how the statistical techniques you have already learned are used in practice:

Watson, J., Kinstler, A., Vidonish III, W. P., Wagner, M., Li, L., Davis, K. G., . . . Daraiseh, N. M. (2015). Impact of noise on nurses in pediatric intensive care units. American Journal of Critical Care, 24(5), 377–384. doi:10.4037/ajcc2015260

In the statistical analysis and results section, the authors report that the noise level in the three units was compared. Because they were comparing three groups, what statistical test was utilized, and where were significant differences found? The researchers later offer an explanation for why this may be the case. What explanation is provided?