Maths Unit 1 Edexcel

Rough guide, some topics not on because notes are made separately.

HideShow resource information
  • Created by: Rachel
  • Created on: 26-04-11 17:21
Preview of Maths Unit 1 Edexcel

First 187 words of the document:

Unit 1 GCSE Maths
Methods of Sampling
See sheet attached to this page.
Stratified sampling
2000 small caps
4000 medium caps
3000 large caps
1000 extra large caps
Total= 10000
Sample= 50
Small= 2000 x 50 = 10 caps
Medium= 4000 x 50= 20 caps
Large= 3000 x 50= 15 caps
Ex Large= 1000 x 50= 5 caps
In General:
No. to Take= subgroup size x sample size
Discrete Data
Is any data which can only take a value from a given list. This is counted e.g. siblings.
Continuous Data
Is any data which can take any value in a given range. This is measured. E.g. weight (can get more
Quantitative Data
Above are both types of this data, measured or counted.
Qualititive Data
Data about properties.
Add up data, divide by how many values
Most common
Most occurring value
Middle in range
Middle value once ordered
Difference between highest and lowest.

Other pages in this set

Page 2

Preview of page 2

Here's a taster:

Raw Data Frequency Table Grouped Frequency Table
No. Of TVs
1, 5, 2, 3, 2, 3, 2,
3, 5 ,0, 2, 2, 3, 1, 1, 0, 4, No Tall Freq No. Of TV No. Tally Frequenc
1, 2, 3, 2, 3, 1, . y .…read more

Page 3

Preview of page 3

Here's a taster:

Lower Quartile: 1 n n= the number of pieces of data you
Median: 1 n
Upper Quartile: 3 n
If these are a decimal value, always round-up!
If it works out to be an integer (whole number) then take the average of this and the
next value
No.…read more

Page 4

Preview of page 4

Here's a taster:

On the table, the cumulative frequency is a column totalling the number of values entered in the
frequency column so far.
On the graphs, the co-ordinates will be the group value (or score), cumulative frequency value.
It should always go up!
When plotting, if the table has a range of values in each group, take the HIGHEST in the
Finding the median on a cumulative frequency table. Add 1 to the number of items and
halve it.…read more

Page 5

Preview of page 5

Here's a taster:

The stem and leaf diagram is formed by splitting the numbers into two parts - in this case, tens
and units.
The tens form the 'stem' and the units form the 'leaves'.
This information is given to us in the Key.
It is usual for the numbers to be ordered. So, for example, the row
shows the numbers 21, 23, 24, 24, 25 and 27 in order.
Shows graphically the median group.…read more

Page 6

Preview of page 6

Here's a taster:

From the tree diagram, we can see that there are eight possible outcomes. To find out the
probability of a particular outcome, we need to look at all the available paths (set of branches).
The sum of the probabilities for any set of branches is always 1.
Also note that in a tree diagram to find a probability of an outcome we multiply horizontally and
add vertically.…read more

Page 7

Preview of page 7

Here's a taster:

Bar Graph
Discrete data. Gaps in between, separate figures, block labelled.
Continuous data. No gaps. Range given, lines labelled. Individual bars are not labelled because
the data is continuous. Doesn't have to start at 0.
Frequency Polygon
Plotted at the midpoints of the bars on histograms.…read more


No comments have yet been made

Similar Mathematics resources:

See all Mathematics resources »See all resources »