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19. What does a skewed distribution mean?
A. The scores are normally distributed.
B. The mean and the median are equal.
C. The mode, the mean and the median are equal.
D. The scores are concentrated more at one end or the other end.
If a distribution of scores is normally distributed, it will not be skewed. This question talks about skewed distributions. Therefore, option A - The scores are normally distributed - must be eliminated.
We should bear in mind that there there are two types of skewed distributions - positively-skewed distributions and negatively-skewed distributions. A positively-skewed distribution is that where scores are more on the left side (low scores). A negatively-skewed distribution is that where scores are more on the right side (high scores).
The answer if option D - The scores are concentrated more at one end or the other end.
20. What does not belong to the group?
A. Short-answer
B. Restricted-response
C. Completion
D. Multiple-Choice
Short-answer tests and restricted-response tests are actually kinds of essay tests. None between A and B is the answer.
Completion is a supply-type test. So are short-answer and restricted response tests. There are the tests where students are expected to provide the answer themselves.
A, B and C are supply-type tests. Option D - Multiple-Choice - is not a supply- but a select-test. Therefore, D is the answer.
21. Which is a type of graph in which lines represent each score or set of scores?
A. Scattergram
B. Histogram
C. Frequency Polygon
D. Scatterplot
Scattergram and scatterplot are the same things. Eliminate options A and D.
Histogram is a kind of graphic representation, using, usually, vertical bars to show frequencies of individual items. A frequency polygon is where midpoints of the interval of corresponding rectangle in a histogram are joined together by straight lines. It gives a polygon i.e. a figure with many angles
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