One sample is selected to represent scores in treatment 1 and a second sample is used to represent scores in treatment 2 . Which set of sample statistics would present the clearest picture of a real difference between the two treatments?
a. M1 = 36, M2 = 40, and both variances = 43
b. M1 = 36, M2 = 40, and both variances = 6
c. M1 = 38, M2 = 40, and both variances = 43
d. M1 = 38, M2 = 40, and both variances = 6
B
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a. unsuccessful without psychoanalysis b. successful c. a temporary fad d. largely unsuccessful
Most developmentalists today are strongly committed to one of the theories described in this chapter
Indicate whether this statement is true or false.
Humans emerged as a species about _________ years ago
a. 2 billion c. 2 million b. 20 million d. 200,000