Use an ANOVA with 5% significance level to determine whether there are any significant mean differences among the cereals. P – the number of letters in your last name multiplied by 5.
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 hours); 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 auditory 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:
|
Normal Sleep |
Sleep-Deprived for 24 Hours |
Sleep-Deprived for 48 Hours |
|
85 |
60 |
60 |
|
83 |
58 |
48 |
|
76 |
76 |
38 |
|
64 |
52 |
47 |
|
75 |
63 |
P |
Use an ANOVA with 5% significance level to determine whether there are any significant mean differences among the cereals.
P – the number of letters in your last name multiplied by 5.
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