Second Exam – QM

The second exam is on October 28, 2010

From Elementary Statistics in Social Research, you should have read Chapter 4 and pages 97-115 from Chapter 5 and you should be familiar with the z-score chart on 361-364.

A. Measures of dispersion

1.      Know how to calculate the range.

2.      Know how to calculate the variance.

3.      Know how to calculate the standard deviation (SD).

4.      Be able to express in words what purpose standard deviation serves.

B. Types of distribution

1.      Know the different types of distribution: normal, positively skewed, negatively skewed, bimodal.

2.      If given an array (or set) of numbers, be able to say what kind of distribution it is.

3.      Be able to say in a word, or words, how the various distributions appear visually.

4.      Be able to say what is the statistical characteristics of distributions—i.e., in terms of the mode, the median and the mean.

5.      Be able to discuss the salient characteristics of a normal curve

C.  Z-Scores

1.      Know what is a z-score: “It is a score that indicates the relationship between a raw score and the totality of scores in a distribution.” Be able to draw this.

2.      Know how to calculate a z-score. The formulas below say the same thing, the first with Roman letters, the second with Greek.

3.      Know the law of 68%-95%-99%

4.      Know how to calculate the percentage of persons who scored less than (or more than) any given raw score, if given a z-score.

5.      Know how to calculate the percentage of persons who scored less than (or more than) any given raw score, if given the mean and the standard deviation for the all the scores of a distribution.

6.      Know what percentile means.

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