3.3 Linear Interpolation, Regression Equations And Statistical Diagrams Flashcards
1
Q
Equation for Q1
A
(n+1)/4
2
Q
Equation for Q3
A
3(n+1)/4
3
Q
Equation for IQR
A
Q3-Q1
4
Q
Outlier equations
A
Q1
Q1-(1.5xIQR)
Q3
Q3+(1.5xIQR)
5
Q
Frequency density equation
A
Frequency = frequency density x class width
6
Q
Adv and disadv of box plot
A
Adv
- highlights outliers
- easy to compare data sets
Disadv
- data is grouped into only four categories so some detailed analysis is not possible
7
Q
Adv and disadv of histogram
A
Adv
- clearly shows shape of distribution
Disadv
- doesn’t always highlight outliers
- it is possible but not easy to estimate Q1, Q2 and Q3
8
Q
Adv and disadv of cumulative frequency
A
Adv
- makes it easy to find the five number summary
Disadv
- doesn’t always highlight outliers
- if interval boundaries are not shown the degree of detail is not clear
9
Q
Bivariate data
A
Data relating to pairs of variables
10
Q
Diff types of correlation
A
- Positive
- Negative
- Zero
11
Q
How do we quantify the correlation between two variables?
A
12
Q
Causal relationship
A
When a change in one variable causes a change in the other
13
Q
Regression line equation
A
