A sleep researcher conducts an experiment to determine whether sleep loss affects the ability to maintain sustained attention. Fifteen individuals are randomly divided into the following three groups of five subjects each: group 1, which gets the normal amount of sleep (7-8); group 2, which is sleep-deprived for 24 hours; and group 3, which is sleep-deprived for 48 hours. All three groups are tested on the same auitory vigilance task. Subjects are presented with half-second tones spaced at irregular intervals over a 1-hour duration. Occasionally, one of the tones is slightly shorter than the rest. The subject's task is to detect the shorter tones. The following percentages of correct detections were observed (in picture): g. Do a planned comparison between the means of the 48-hour sleep deprived group and the normal sleep group to see whether these conditions differ in their effect on the ability to maintain sustained attention. Use α=0.05(2tail). What do you conclude? h. Do post hoc comparisons, comparing each pair of means using the Newman-Keuls test and α=0.05(2tail). What do you conclude? i. Same as part h, but use the HSD test. Compare your answers to part h and i. Explain any difference.
A sleep researcher conducts an experiment to determine whether sleep loss affects the ability to maintain sustained attention. Fifteen individuals are randomly divided into the following three groups of five subjects each: group 1, which gets the normal amount of sleep (7-8); group 2, which is sleep-deprived for 24 hours; and group 3, which is sleep-deprived for 48 hours. All three groups are tested on the same auitory vigilance task. Subjects are presented with half-second tones spaced at irregular intervals over a 1-hour duration. Occasionally, one of the tones is slightly shorter than the rest. The subject's task is to detect the shorter tones. The following percentages of correct detections were observed (in picture):
g. Do a planned comparison between the means of the 48-hour sleep deprived group and the normal sleep group to see whether these conditions differ in their effect on the ability to maintain sustained attention. Use α=0.05(2tail). What do you conclude?
h. Do post hoc comparisons, comparing each pair of means using the Newman-Keuls test and α=0.05(2tail). What do you conclude?
i. Same as part h, but use the HSD test. Compare your answers to part h and i. Explain any difference.
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