A clinical psychologist administered a test with 10 trials designed to measure alertness in three groups of subjects where alertness differed on the basis of their sleeping habits. The resulting data is presented below.

Research question: Is there a difference in the alertness level among the three groups? If yes then how do they differ?

Alertness scores of subjects classified according to sleeping habits

Very light sleepers: 5.3 5.7 5.5 5.9 5.1 5.3 5.8 6.0 6.2. 5.4

Light sleepers: 6.9 6.2 6.1 6.0 6.6 6.6 6.6 6.4 6.8 6.5

Good sleepers: 7.6 7.7 7.8 7.7 7.6 7.9 7.8 7.5 7.7 7.4

Use appropriate descriptive statistics methods (tabular, graphical and numerical) or any other statistical methods to answer the question of interest. Use tables and charts if needed to explain your answer. Summarize and interpret your findings.

P.S.Please do not use Data Analysis Tool Pak for this exam. Excel/ Calculators allowed.