Dog breeders apply which principle?
A. Mendelian genetics
B. Natural selection
C. Migration
D. Artificial selection
Answer: D
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Girls tend to have more difficulty adjusting to the presence of a stepfather in part because
a. boys generally like having a stepfather with whom they can play sports. b. girls often view the stepfather as disrupting their relationship with their mother. c. girls tend to maintain a stronger bond with the father (even though he does not have custody) than boys. d. girls tend to view the stepfather as making their mothers less happy.
For a repeated-measures study comparing two treatment conditions, a researcher obtains a sample of n = 9 difference scores with a mean of MD = 4 and a variance of s2= 36 . What is the value for the repeated-measures t statistic for these data?
a. 4/2 c. 4/6 b. 4/4 d. 4/36
Two observers record similar observations on a behavioral rating scale for a group of children they are watching. The researchers have established what kind of reliability?
a. split-half reliability b. internal reliability c. test-retest reliability d. inter-rater reliability
Learning a second language is easier to do in childhood than in adulthood. This is an
example of __________ periods in perceptual development. Fill in the blanks with correct word