A sleep specialist investigated the impact of watching TV and using computers, before bedtime, on sleep onset. He obtained 30 college student volunteers and randomly assigned them to three equally sized groups: (1) Work on a computer for 30 minutes before going to bed, (2) Watch TV for 30 minutes before going to bed, and (3) Don€™t work on a computer or watch TV before bedtime. He then measured time to sleep onset (in minutes), finding means for the three groups, respectively, of 19.60, 17.40, and 5.30. Given the ANOVA summary table, r²= 65.63%, and HSD = 5.32, complete a four-point interpretation of the results using α = .05.

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Source of Sum of Degrees of Mean Variability Squares Square ratio Freedom Between 1,185.80 2 592.90 25.78 groups Within 620.90 27 23.00 groups Total 1,806.70 29