Sleep deprivation and reaction times. Sleep deprivation experienced by physicians during residency training and the possible negative consequences are of concern to many in the health care community. One study of 33 resident anesthesiologists compared their changes from baseline in reaction times on four tasks.5 Under baseline conditions, the physicians reported getting an average of 7.04 hours of sleep. While on duty, however, the average was 1.66 hours. For each of the tasks the researchers reported a statistically signi?cant increase in the reaction time when the residents were working in a state of sleep deprivation.
(a) If each task is analyzed separately as the researchers did in their report, what is the appropriate statistical method to use? Explain your answer.
(b) Is it appropriate to use a one-way ANOVA with I = 4 to analyze these data? Explain why or why not. a 10-point scale with 1 indicating total lack of importance and 10 indicating very high importance. The following table summarizes these results:
|
Class
Freshman
|
n
724
|
Mean score
7.6
|
|
Sophomore
|
536
|
7.6
|
|
Junior
|
593
|
7.5
|
|
Senior
|
437
|
7.3
|
(a) To compare the mean scores across classes, what are the degrees of freedom for the ANOVA F statistic?
(b) The MSG = 11.806. If sp = 2.16, what is the F statistic?
(c) Give an approximate (from a table) or exact (from software) P-value. What do you conclude?