Chapter 3 Flashcards
1
Q
Contingency table
A
used to classify sample observations according to two or more characteristics
AKA cross tabulation table
involves multiple population proportions
BASICALLY a data array
2
Q
Why are scatter plots used?
A
to show the relationship between 2 variables
may be the most common and most effective display for data
3
Q
What kind of relationships do curvilinear scatter plots have?
A
weak
4
Q
What does correlation measure?
A
the strength of the linear association between two variables
5
Q
Is correlation sensitive to outliers?
A
YES
6
Q
Lurking variable
A
a hidden variable that stands behind a relationship and determines it by simultaneously affecting both variables
7
Q
If there is a cloud on your scatterplot, what is the correlation?
A
There is no correlation
