Stats Chapter 2

Front 1

Grouped frequency table distribution table rules

Back 1

1. The number of intervals (rows) should be around 10
2. The width of the interval should be an easy number to count by
3. The lower score in the interval should be a multiple of the width
4. All intervals are the same width, with no gaps or overlaps

Front 2

How to decide interval width

Back 2

Approximate range / width = approx # rows

Front 3

Histogram

Back 3

for continuous interval or ratio data. Bar touch in order to display continuous data

Front 4

Bar graph

Back 4

used to display discrete variable data

Front 5

Real limits

Back 5

.5 above/below

Front 6

Apparent limits

Back 6

The lowest/highest values

Front 7

Shape

Back 7

One of the three important dimensions to describe distribution

Front 8

Frequency bar graph

Back 8

bars do NOT touch
Categorical variables go on X axis

Front 9

Percentile ranks

Back 9

% of the scores at or below a particular point (URL of interval)

Front 10

Cumulative frequency

Back 10

The number of scores accumulated by the time you reach the URL

Front 11

Cumulative %

Back 11

The % of scores accumulated by the time you reach the URL (percentile rank)

Front 12

Interpolation & its assumptions

Back 12

An estimation process typically used when you have a table of values and some values are missing

Assumptions:
1. there are known points on the two scales that correspond precisely
2. 2 scales increase/decrease at the same rate
3. Ratios of distances on the two scales are equal