A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss. Immediate memory is defined as the amount of material that can be remembered shortly after it has been presented. Twelve students are randomly selected from Introductory Psychology and randomly assigned to two groups of six each. One of the groups is sleep deprived for 24 hours before the material is presented. All subjects in the other group receive the normal amount of sleep (7-8 hours). The material consists of a series of slides, with each slide containing nine numbers. Each slide is presented for a short time interval (50 milliseconds), after which the subject must recall as many numbers as possible. The following are the results. The scores represent the percentage correctly recalled. Normal Sleep Group 1 Sleep-Deprived Group 268 7073 6272 6865 6370 6973 60 Analyze this data. Use a two-tailed test at an alpha of .05. Include information about the 95% confidence interval.
A psychologist is interested in determining whether immediate memory capacity is affected by sleep loss. Immediate memory is defined as the amount of material that can be remembered shortly after it has been presented. Twelve students are randomly selected from Introductory Psychology and randomly assigned to two groups of six each. One of the groups is sleep deprived for 24 hours before the material is presented. All subjects in the other group receive the normal amount of sleep (7-8 hours). The material consists of a series of slides, with each slide containing nine numbers. Each slide is presented for a short time interval (50 milliseconds), after which the subject must recall as many numbers as possible. The following are the results. The scores represent the percentage correctly recalled.
Normal Sleep Group 1 Sleep-Deprived Group 2
68 70
73 62
72 68
65 63
70 69
73 60
Analyze this data. Use a two-tailed test at an alpha of .05. Include information about the 95% confidence interval.
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