Statistics Section 2

?
  • Created by: Ellie
  • Created on: 22-05-13 19:07
Frequency tables
a table that shows you how many of each value there are. you must use tallies so you dont make mistakes page 24
1 of 26
Grouped Frequency tables
use these when you've got a large range of data values- the data is split into groups using class intervals page 25
2 of 26
Countinous data
> means greater than < means less than >_ greater than or equal to <_ means less than or equal to page 26
3 of 26
two-way tables
bivariate data measures two variables often to investigate links between them page 27
4 of 26
Simplifing tables
simplifing tables makes it easier to pick out useful infomation. easiest way of simplifing is totalling page 28
5 of 26
Simplifing tables
totalling percentages grouping it combining class intervals page 28-30
6 of 26
Pictograms
use pictures to represent data page 31
7 of 26
Multiple bar charts
can be used to compare data sets page 31
8 of 26
composite bar charts
show proportions in the data page 32
9 of 26
pie charts
show proportions page 33
10 of 26
comparative pie charts
use areas. size of pie chart matters!!!! page 33
11 of 26
transforming data
from bar chart to pie chart pie chart to bar chart page 34
12 of 26
Vertical line graph
is like a bar chart but with lines. show frequency distributions for DISCRETE data. page 35
13 of 26
cumulative frequwncy step polygons
the cf is a running total of the frequencies- the total number less than or equal to each value. page 35
14 of 26
Frequency polygon
uses the midpoint of each class page 36
15 of 26
cumulative frequency graph
uses the highest value page 36
16 of 26
Histograms
can have unequal class widths. it is the area you look at not just height or width. can use them to estimate frequencies. page 37
17 of 26
Frequency distributions
see page 38
18 of 26
normal distribution
-symmetrical about the mean - this symmetry means that the mean, mode, median are all the same - 95% of values are within +- 2 standard deviations of mean - almost all 99.8% of values are within +- 3 standard deviations of mean. page 38
19 of 26
steam and leaf diagrams
show shapes of distributions. can have unordered and ordered read question for what it wants. can compare two sets of data back to back. page 39
20 of 26
population pyramids
made from 2 bar charts (sideways) that are back to back so you can compare the data they show. page 40
21 of 26
choropleth maps
use shading, hatched lines or dots, different regions of the map are shaded differently depending on the value of the data. page 40
22 of 26
scatter diagrams
used for bivariate data. used when you have two different variables. page 41
23 of 26
line of best fit
draw one if there is a relationship. see page 41 for correlations
24 of 26
time series
are plotted with time on the x-axis. there are two variables. they have fluctuations page 42
25 of 26
problems and errors with diagrams
see page 43 -45
26 of 26

Other cards in this set

Card 2

Front

use these when you've got a large range of data values- the data is split into groups using class intervals page 25

Back

Grouped Frequency tables

Card 3

Front

> means greater than < means less than >_ greater than or equal to <_ means less than or equal to page 26

Back

Preview of the back of card 3

Card 4

Front

bivariate data measures two variables often to investigate links between them page 27

Back

Preview of the back of card 4

Card 5

Front

simplifing tables makes it easier to pick out useful infomation. easiest way of simplifing is totalling page 28

Back

Preview of the back of card 5
View more cards

Comments

Ellie

Report


I have used the cgp revision guide for this

Similar Statistics resources:

See all Statistics resources »