 Statistical Presentation, Analysis and Interpretation
 Comparative/Group/Multiple Line Graph
 Comparative Bar Graph
 Divided Bars or Rectangles
Statistical Presentation, Analysis and Interpretation
Temperature and Rainfall for Thika
Month  J  F  M  A  M  J  J  A  S  O  N  D 
Temp(◦c)  24  24  23  22  19  17  17  18  19  20  22  23 
Rainfall(mm)  109  122  130  76  52  34  28  38  70  108  121  120 
Analysis and Interpretation
 The month with heaviest rainfall is May.
 The month with lowest rainfall is July.
 The hottest month was January and February.
 The months with lowest temperature were June and July.
Crop Production in Kenya in the Years 2001 and 2002
crop  Amount in metric tonnes  
2001  2002  
Tea  300,000  500,000  
Coffee  120,000  80,000  
wheat  120,000  150,000  
Maize  250,000  400,000 
Value of export Crops from Kenya (ksh million)
Crop  1997  1998  1999  2000  2001 
Tea  24126  32971  33065  35150  34485 
Coffee  16856  12817  12029  11707  7460 
Horticulture  13752  14938  17641  21216  19846 
 If the data has large figures e.g. 195262 plot in 1000s=195, 184,988=185.
 You can draw comparative/group/multiple line and bar graphs from the data.
Comparative/Group/Multiple Line Graph
Advantages
 Simple to construct
 Suitable when comparing trends or movements
 Comparison of items is easy because the graphs are drawn using common axis
 It’s easy to read exact values from each graph
Disadvantages
 Number of items which can be represented are limited
 Crossing of lines may make interpretation and comparison difficult and confusing.
 Total amount of variable can’t be established at a glance.
Comparative Bar Graph
Advantages
 Easy to construct
 Easy to read and interpret
 Easy to compare similar components within different bars.
 Gives a good impression of totality.
 Individual contribution made by each component is clearly seen.
 Differences in quantity of components are clearly seen.
Disadvantages
 Doesn’t show trend of components over time.
 Not easy to compare components where bars are many
 Not suitable for many components.
Divided Bars or Rectangles
Production of Sugarcane in 1000 tonnes of 5 major factories in Kenya
Factory  Production(ooo tonnes)  Length in cm 
Sony  50  0.5 
Nzoia  100  1 
Chemilil  200  2 
Muhoroni  250  2.5 
Mumias  400  4 
Total  1000  10 
Reported Visitor Arrivals by Continent for the Year 2000
Continent  No. of visitors  Length of strip (cm) 
Africa  153904  1.5 
America  77271  0.8 
Asia  58784  0.6 
Europe  663906  6.6 
Other  82672  0.8 
Total  10.3 
Look for a convenient scale say 1cm rep 100000 visitors
 Draw a divided rectangle 10 cm long to represent the data.
 Show your calculations.
 It should have the following:
 Title
 Different shades
 Key
 Width of 2 cm
Analysis and Interpretation
 To get the meaning of
 Factory leading in sugar production is Mumias.
 The 2^{nd }leading is Muhoroni.
 Factory with the lowest production of sugar is Sony.
 Calculation of %s.
Advantages
 Easy to construct
 Easy to compare components because they are arranged in ascending or descending order.
 Takes less space than when the data is presented using graphs.
 Each component proportion to the total can easily be seen at a glance.
Disadvantages
 Can’t be used for a large data.
 Only one unit of measurement can be used.
 Difficult to assess values of individual component
 The visual impression isn’t as good as pie charts.
Exercise
 Temperature and Rainfall for Kisumu
Month
J
F
M
A
M
J
J
A
S
O
N
D
Temp(◦c)
19
20
20
18
20
19
19
18
18
18
18
18
Rainfall(mm)
18
38
66
127
114
84
112
104
69
56
38
31
 Draw a bar graph to represent rainfall figures.
 Calculate the mean monthly temperature for the place.
 Calculate the mean annual temperature range.
 Calculate the annual rainfall totals.

Temp/Day
Mon
Tue
Wed
Thurs
Fri
Sat
Sun
Max ◦c
28
27
28
26
29
29
26
Min ◦c
18
18
20
16
22
21
19
 Calculate the diurnal/daily temperature range for Tuesday.
 Calculate the mean daily temperature for Sunday.
 Suppose at 40 ◦c air can hold 60g/m3 of water vapour and the maximum vapour it can hold is 70g/m3. Calculate the relative humidity.
 (a) Calculate the time at Lamu 70◦E when time at GWM is noon.
(b) Calculate the longitude of Watamu whose time is 6pm when time at GWM is 9am.  Students from a certain school obtained the following marks in their end of term geography examination.
74, 52, 48, 60, 48, 32, 80, 67 and 85.
Calculate the following: Median
 Mode
 Mean
 State their advantages and disadvantages.
 (a) Calculate the scale given that the ground distance is 200km while the distance on the map is 20cm.
(b) A student measured the length of a road on a map from point A to B and found it to be 3.6 cm. Use a scale of 1:50000 calculate the actual/ground distance in km.  Students intend to carry out field study of a forest around their school.
 State two ways in which they’d prepare themselves.
 State 2 objectives they’d have formulated for their study.
 List two problems they’d have encountered in the field.
 State two follow up activities they would have after the field study.
Download Statistical Methods  Geography Form 2 Notes.
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