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Flashcards in CH 8 + Dillman 1-2 Deck (15)
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1

Frequency Distribution

Presents the number and percentage of participants for each score on the variable

2

Measures of Central Tendency

give an estimate of the center of the distribution; mean, median, mode

3

Mean

the average of all the scores of the distribution; relatively stable, is more easily affected by extreme scores

4

Median

divides a distribution in half, preferred when a distribution is highly skewed or asymmetrical

5

Mode

the most frequentyl occurring score

6

Measures of Dispersion

variability or the spread of the scores; range, variance, standard deviation

7

Variance

the average squared distance of scores from the mean

8

Standard deviation

the average distance of scores from the mean

9

Range

the difference between the highest and lowest scores in a distribution

10

Correlation Coefficient

provides a measure of the association between variables

11

What are some of the issues to keep in mind regarding correlation?

1. Causation
2. Sample Size
3. Group Differences
4. Restriction of Range

12

What are the four cornerstones of quality surveys?

Coverage Error, Sampling Error, Nonresponse Error, Measurement Error

13

Coverage Error

Occurs when the list from which sample members are drawn does not accurately represent the population

14

Sampling Error

The difference between the estimate produced when only a sample of units on the frame is surveyed and the estimate when every unit on the list is surveyed

15

Nonresponse Error

The difference between the estimate produced when only some of the sampled units