Essay
A common technique in the field of testing is to arrange scores so that a test will have a mean of 50 and a standard deviation of 10. For such a test,
a. what scores separate the middle 25% from the rest?
b. what proportion would be expected to score 68 and above?
c. what proportion would be expected to score between 45 and 55?
d. what proportion would be expected to score between 55 and 65?
e. what proportion score above 35?
f. what score separates the top third on such a test?
Correct Answer:
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a. z = 0.32 ; 50 ± (.32)(10) = 46.80 and...View Answer
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