Unbenannt.notebook
1
February 13, 2015
Jun 1915:36
L.O.• all pupils can gather information
• all pupils can organise collected data
Experimental Probability Data Collection
Jun 2508:27
Main 1: gather information
On your paper write down you height (estimate if you do not know) and your
handspan
Height:
Handspan:
Jun 1915:37
Main 1:Height
gather information
Handspan
Jun 1915:36
L.O.• all pupils can gather information
• all pupils can organise collected data
Experimental Probability Data Collection
Jun 1915:37
Main 2: organise collected data
o Tally Chartso Two Way Tableso Stem and leaf diagramso Bar Chartso Histogramso Pie Chartso Scattergraphs (line of best fit,
correlation, linear regression)o Types of Average (mean, median,
mode, interquartile range)o Cumulative Frequency Diagramso Boxplots
Jun 1915:37
Main 2: organise collected data
There are worksheets for these topics - the worksheet is available on the website
and I will set you homework on it.
I haven't printed it off as it is 20 pages long.
Unbenannt.notebook
2
February 13, 2015
Jun 1915:37
Main 2: organise collected data
o Tally Charts
Firstly, lets practice
Jun 1915:37
Main 2: organise collected datao Tally Charts
Don't forget to label your right hand
column 'Frequency'
Jun 1915:37
Main 2: organise collected data
o Tally Charts
Organise you data into:
Height
Handspan
Feb 911:17
Main 2: organise collected data
o Two Way Tables
Feb 911:17
Main 2: organise collected datao Two Way Tables
1. How many students participated in the survey?2. How many students said they "like" snowmobiles?3. How many of the students "like" snowmobiles, but
"do not like" skateboards? 4. How many students said they "do not like"
skateboards?
Jun 1915:37
Main 2: organise collected data
Firstly, lets practice
o Stem and leaf diagrams
Unbenannt.notebook
3
February 13, 2015
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
What do you think a stem and leaf diagram could look like?
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Here are the marks gained by 30 students in an examination:63 58 61 52 59 65 69 75 70 54 57 63 76 81 64 68 59 40 65 74 80 44
47 53 70 81 68 49 57 61
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Unbenannt.notebook
4
February 13, 2015
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
Worksheet to:a) read off valuesb) create stem and leaf diagramsc) read off further information
Jun 1915:37
Main 2: organise collected datao Stem and leaf diagrams
What are the arrows indicating?
Jun 1915:37
Main 2: organise collected data
Organise you data into:
Height
Handspan
o Stem and leaf diagrams
Jun 1915:37
Main 2: organise collected data
Firstly, lets practice
o Bar Charts
Unbenannt.notebook
5
February 13, 2015
Jun 1915:37
Main 2: organise collected datao Bar Charts
Jun 1915:37
Main 2: organise collected dataOrganise you data into:
Height
Handspan
o Bar Charts
Jun 1915:37
Main 2: organise collected data
Firstly, lets practice o Histograms
Jun 1915:37
Main 2: organise collected datao Histograms
Jun 1915:37
Main 2: organise collected datao Histograms
This is a HistogramHow is it different
to a bar chart?
Jun 1915:37
Main 2: organise collected datao Histograms
Key Points:• NO GAPS
• area of bar is proportional to frequency• frequency density is on the y axis
• f.d. = freq class width
Unbenannt.notebook
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February 13, 2015
Jun 1915:37
Main 2: organise collected datao Histograms
On a histogram, the area of the bar tells us the _______ . On a bar chart, the ____ of the bar tells us the frequency.
On a histogram, the y-axis shows the ________
On a histogram, the bars are ________ of equal width.
On a _______ there are no gaps between bars
heightfrequencywidth
frequency density
alwayssometimes Bar Chart
Histogram
Jun 1915:37
Main 2: organise collected datao Histograms
Frequency density = frequency class width
Freq
uenc
y de
nsit
y
class width
Freq
uenc
y
Jan 1717:22
Find the class width for the following intervals:1) 0 ≤ t < 10
2) 10 ≤ t < 25
3) 25 ≤ t < 45
4) 45 ≤ t < 60
5) 60 ≤ t < 80
6) 80 ≤ t < 90
Main 2: organise collected datao Histograms
Jan 1717:22
Time Frequency Frequency density
0 ≤ t < 10 30 30 ÷ 10 = 310 ≤ t < 25 30 30 ÷ 15 = 225 ≤ t < 45 20 20 ÷ 20 = 145 ≤ t < 60 45 45 ÷ 15 = 360 ≤ t < 80 80 80 ÷ 20 = 480 ≤ t < 90 60 60 ÷ 10 = 6
Main 2: organise collected datao Histograms
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