All of the following statements are true about independent-samples t tests EXCEPT ______.
A. they involve the same hypothesis-testing procedures as one-sample z test
B. they can be used when the sample means are unknown
C. they can be used when the population variance is unknown
D. they compare the calculated t scores from a sample to a t distribution
Answer: B
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According to evolutionary theory, it can be adaptive for people to help others who share their genes. This idea is known as ____
a. kin selection b. natural selection c. gene investment theory d. survival of the fittest
Major depression is simply a state of sadness or "the blues."
Indicate whether the statement is true or false
"Blunted affect" refers to an inability to experience pleasure
Indicate whether the statement is true or false
When people have experienced multiple traumas, they are more likely to develop ___________
Fill in the blank(s) with the appropraite word.