A researcher is interested in the effects of sleep deprivation and caffeine intake on mood. Participants were randomly assigned to a sleep condition (normal or deprived) and a caffeine condition (0 cups, 2 cups, or 4 cups). After the manipulations, mood was measured (such that higher numbers indicated better mood). The results were as follows:

Normal condition Deprived condition

0 cups 2 cups 4 cups 0 cups 2 cups 4 cups

16 18 18 0 5 6

17 20 17 6 4 8

20 20 17 3 4 6

19 19 17 2 2 7

18 18 16 4 5 8

Analyze these data using a factorial analysis of variance and including R for each effect