Maths Unit 1 Edexcel

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

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Unit 1 GCSE Maths
Statistics:
Methods of Sampling
See sheet attached to this page.
Stratified sampling
Example
2000 small caps
4000 medium caps
3000 large caps
1000 extra large caps
Total= 10000
Sample= 50
Small= 2000 x 50 = 10 caps
10000
Medium= 4000 x 50= 20 caps
10000
Large= 3000 x 50= 15 caps
10000
Ex Large= 1000 x 50= 5 caps
10000
In General:
No. to Take= subgroup size x sample size
Total
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
accurate)
Quantitative Data
Above are both types of this data, measured or counted.
Qualititive Data
Data about properties.
Mean
Average
Add up data, divide by how many values
Mode
Most common
Most occurring value
Median
Middle in range
Middle value once ordered
Range
Difference between highest and lowest.

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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

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Lower Quartile: 1 n n= the number of pieces of data you
have
4
Median: 1 n
2
Upper Quartile: 3 n
4
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

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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
group.
Finding the median on a cumulative frequency table. Add 1 to the number of items and
halve it.…read more

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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

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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

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Graphs
Bar Graph
Discrete data. Gaps in between, separate figures, block labelled.
Histogram
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

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