Chapter 5- Other Descriptive Statistics

Question 1

Z score

Answer 1

A score expressed in standard deviation units

Question 2

Standard score

Answer 2

Score expressed in standard deviation units; z is one for example

Question 3

Outliers

Answer 3

Scores in a distribution that are unusually large or unusually small

An extreme score separated from the others and at least 1.5 x IQR beyond the 25th or 75th percentile

Question 4

Boxplots

Answer 4

Graph that shows a distribution’s range, interquartile range, skew, median, and sometimes other things

The dot is the mean
The line is the median
The box itself is the IQR
The extended lines are the range

Question 5

Effect size index

Answer 5

Amount or degree of separation between two distributions
Lowercase d
Is called Cohen’s d

Measures the difference per standard deviation unit

Small effect- 0.2
Medium effect- 0.5
Large effect- 0.8

Question 6

What is an extreme score?

Answer 6

1. More than 2 sd above or below the mean
2. A z-score of greater than 2 and less than -2
3. Unrealistically large/unrealistically small