Which of the following methods of estimating the reliability of norm-referenced tests requires two administrations of the same test to the same group of individuals, with the calculation of the correlation coefficient between the two sets of scores?
A. The split-half method
B. The test-retest method
C. Kuder-Richardson Formula 21
D. The parallel forms method
Answer: B
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The area on the tungsten target where the electrons hit is the ____________
a. collimator b. central beam c. anode d. focal spot