Statistics Alive! Flashcards Preview

1. Psychology > Statistics Alive! > Flashcards

Flashcards in Statistics Alive! Deck (75)
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1

Kurtosis

Height of a distribution is affected by too many or too few middle scores

2

Leptokurtic

A distribution with many middle scores

3

Platykurtic

A distribution with few middle scores

4

Nominal scale

Classifies cases into categories

5

Ordinal scale

Ranks scores by degree to which they possess the measured trait

6

Interval scale

Distances between adjacent scores are equal and consistent throughout the scale. (equal-interval scale)

7

Ratio scale

Interval scale with addition of absolute zero point.

8

Continuos variable

Variables where values could theoretically fall between adjacent scale units (height, weight, time)

9

Discrete data

Values that cannot theoretically fall between adjacent scale units (people, photos, etc)

10

Real limit

Half the scale's unit (real limit opposed to observed scores)

11

Frequency table

Lists each observed score along with number of cases falling at each score

12

Cumulative frequency table

Shows how many scores are at or below (or at or above) any given score

13

Relative frequency or percentage table

Gives each score's frequency relative to 100% (values will all be between 0-100).

14

Cumulative relative frequency or cumulative percentage table

Shows percentage above or below a given score

15

Grouped frequency table

Frequency table with score intervals. Can show patterns but have to get right size intervals (not too big or small) by guess and check.

16

Percentile rank table

Indicates percentage of cases falling at or below a given score (not below a given score)

17

Percentile

The score falling at a particular percentile rank (can be any score on table while percentages will be between 0-100)

18

Stem-and-leaf display

Hybrid between table and graph with left column indicating first digit of a score and right column indicating every instance of the next digit

19

Abscissa

X-axis

20

X-axis

Abscissa

21

Ordinate

Y-axis

22

Y-axis

Ordinate

23

Frequency curve or line graph

Midpoints of data connected by a line without bars

24

Skewed

Asymmetric distribution with a single peak

25

Negatively skewed

Many high scores

26

Positively skewed

Many low scores

27

Bimodal

A distribution with 2 peaks. Usually an indication that sample contains two distinct subgroups.

28

Rectangular distribution

Uniform score distribution (like graphing ranks if there are no tied ranks)

29

Bar graph

Graph appropriate for nominal data with x-axis reflecting categories instead of scores

30

Pie graph

Circle graph with slices representing percentages