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Author Question: Which of the following measurements likely has a normal distribution, at least approximately? a. ... (Read 128 times)

beccaep

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on: Jul 24, 2018
Which of the following measurements likely has a normal distribution, at least approximately?
 a. Weights of 10-year old boys.
  b. IQ scores of 12 graders.
  c. Nationwide scores on the SAT (Scholastic Achievement Test).
  d. All of the above.

Question 2

Suppose a professor sees that his students' exam scores do not follow a normal curve, but he decides to assign grades by grading on a bell-shaped curve anyway. Explain how this procedure tends to distort the grades.


SamMuagrove

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Reply #1 on: Jul 24, 2018
Answer to Question 1

D

Answer to Question 2

THIS PROCEDURE HAS A TENDENCY TO ARTIFICIALLY SPREAD OUT CLUMPS OF STUDENTS WHO ARE AT THE TOP OR BOTTOM OF THE SCALE, SO THAT STUDENTS WHOSE SCORES WERE VERY CLOSE TOGETHER MAY RECEIVE DIFFERENT LETTER GRADES.


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