Statistical Methods - Geography Form 2 Notes

Share via Whatsapp


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

comparative 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.

comparative bar graph.PNG



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 2nd 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

  1. 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


    1. Draw a bar graph to represent rainfall figures.
    2. Calculate the mean monthly temperature for the place.
    3. Calculate the mean annual temperature range.
    4. Calculate the annual rainfall totals.
  2.  

    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


    1. Calculate the diurnal/daily temperature range for Tuesday.
    2. Calculate the mean daily temperature for Sunday.
  3. 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.
  4. (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.
  5. 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:
    1. Median
    2. Mode
    3. Mean
    4. State their advantages and disadvantages.
  6. (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.
  7. Students intend to carry out field study of a forest around their school.
    1. State two ways in which they’d prepare themselves.
    2. State 2 objectives they’d have formulated for their study.
    3. List two problems they’d have encountered in the field.
    4. State two follow up activities they would have after the field study.

Download Statistical Methods - Geography Form 2 Notes.


Tap Here to Download for 50/-




Why download?

  • ✔ To read offline at any time.
  • ✔ To Print at your convenience
  • ✔ Share Easily with Friends / Students


Join our whatsapp group for latest updates
.
Subscribe now

access all the content at an affordable rate
or
Buy any individual paper or notes as a pdf via MPESA
and get it sent to you via WhatsApp

 

What does our community say about us?

Join our community on:

  • easyelimu app
  • Telegram
  • facebook page
  • twitter page
  • Pinterest