In this calculation, 
what does the 
symbol (called a sigma) indicate?
A. The 
symbol (called a sigma) indicates that you should average whatever comes after this symbol.
B. The 
symbol (called a sigma) indicates that you should add up whatever comes after this symbol.
C. The 
symbol (called a sigma) indicates that you should subtract whatever comes after this symbol.
D. The 
symbol (called a sigma) indicates that you should multiply whatever comes after this symbol.
Answer: B
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For a sample with M = 40 and s = 4, about 95% of the individuals will have scores between X = 32 and X = 48
Indicate whether the statement is true or false
If genetic factors contribute to IQ scores, then fraternal twins should have:
A. less similar IQ scores than identical twins B. more similar IQ scores than identical twins C. more similar IQ scores than siblings D. totally different IQ scores
In a classic experiment, two groups of rats explored a maze with the first group being rewarded with food at the end of the maze, while the second group wandered the maze but were not rewarded with food at the end of the maze. On another trial, the second group was rewarded with food at the end of the maze. This second group of "uneducated" rats
a. only then began to learn the maze. b. showed only a slightly slower completion time as compared to the first group. c. ran the maze as quickly as the first group. d. never learned the maze until numerous feeding trials were utilized.
It is not until ____ months that an infant's visual acuity is strong enough to discriminate facial features and emotions at further distances
a. 1–2 b. 2–3 c. 4–5 d. 5–6