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A researcher is curious about the effect of sleep on students' test performances. He chooses 60 students and gives each two tests: one given after two hours of sleep and one after eight hours of sleep. The test the researcher should use would be a related samples test.
Embryonic Period
The period from 2 to 8 weeks after fertilization, during which the major organs and structures of the organism develop.
Zygote
Cell resulting from the uniting of the ovum and sperm.
Umbilical Cord
The flexible cordlike structure connecting a fetus to the placenta, delivering nutrients and oxygen and removing waste.
Psychological Closeness
The perception of being emotionally intimate or connected with another person or group.
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