An experimenter investigated the effects of blue light exposure on people’s sleep quality. Researchers get 50 people and randomly assign 25 people to be exposed to blue light for 20 min. before bed and the other 25 people to have no blue light exposure 25 min. before bed. Each participant is sent to bed at 10pm and woken up at 7am the next morning. When all participants are woken up, they must fill out a sleep quality questionnaire. The scores seen below represent participants’ sleep quality ratings where higher numbers indicate better sleep quality. Does the blue light exposure negatively impact sleep quality?
- An experimenter investigated the effects of blue light exposure on people’s sleep quality. Researchers get 50 people and randomly assign 25 people to be exposed to blue light for 20 min. before bed and the other 25 people to have no blue light exposure 25 min. before bed. Each participant is sent to bed at 10pm and woken up at 7am the next morning. When all participants are woken up, they must fill out a sleep quality questionnaire. The scores seen below represent participants’ sleep quality ratings where higher numbers indicate better sleep quality. Does the blue light exposure negatively impact sleep quality?
Blue light No Blue light
11 13
14 16
10 14
11 17
8 13
15 14
12 15
13 18
9 12
11 12
1. Analyze the data by hand or with SPSS/PSPP/JASP using the most appropriate
2. Based on your analysis, did blue light have a significant impact on sleep quality? State your answer in terms of specific IV and DV descriptors and use the p-value calculated as support of your answer.
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Calculate one measure of effect size for this analysis and interpret the measure of effect size using specific IV and DV descriptors.
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