Although the contigent of 300 male and female individuals studied in the sample is a considerable amount of individuals, it is not provided any additional information regarding specific characteristics of these individuals. For instance, it is not explained how old are these subjects. Since people vary their sleeping habits according their ages, it could be that older people, that are also more experienced, …show more content…
Since there is a possibility that people that spend more time at work have less time for their personal activities, it could be plausible that people who work a lot tend to sleep less than people that work less. Therefore, the correlation between sleeping less and having a better work performance could be spurious, since the better performance could be ascribed to the fact that people who tend to work more tend to have a better performance at work and also sleep less. As a result, the assumption that sleeping less hours would be a consequence of good working performance, instead of a