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Researchers wonder if blue light exposure impacts people's ability to fall asleep. Researchers get a group of 7 people and measure how long it takes
Researchers wonder if blue light exposure impacts people's ability to fall asleep. Researchers get a group of 7 people and measure how long it takes them to get to sleep each night after exposure to 10 min. of blue light, 30 min. of blue light, and 60 min. of blue light. Data for each participant can be seen below and represent the participants' number of min. it takes to fall asleep each night. Did people take longer to get to sleep as their blue light exposure increased? Test at = .05. Participant 10 min. 30 min. 60 min. 1 12 12 13 2 13 13 14 3 12 14 14 4 14 13 14 5 13 14 15 6 12 13 14 7 11 12 13 10minutes mean= 12.429, SD=0.976, 30minutes mean=13.000, SD=0.816, 60minutes mean=13.857, SD=0.690 Within sum of squares=7.238, df=2, mean square=3.619, F=12.667, p=0.001, n2=0.679, Residuals sum of squares =3.429, df=12, mean square=0.286 Between sum of squares=9.143, df=6, mean square=1.524, c. Interpret the significance of the test statistic (using p value and real interpretation with IV and DV descriptors). d. Is a post hoc test needed for this analysis? If needed, interpret the results with p values as support. If post hoc are not needed, say that here and explain why. e. Calculate percentage of variance accounted for & Cohen's d i. Percentage of variance = ii. Cohen's d = Interpret percentage of variance using specific IV/DV descriptors
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