data intrepretation introduction (alpha)

7/27/2019 Data Intrepretation Introduction (Alpha)

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Data Interpretation


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What are you supposed to do?Some information is provided in the

form of a -

Chart - Bar chart, Pie chart

Graph - Point graph, Line graph

Table, Or a combination of these.

You are supposed to answer

questions based on this information.


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This is the Reading

Comprehension inmathematics. The information

is available for the reference,you are supposed to read

(interpret) it to answer thequestions.


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PreparationThe mathematics required

for DI is mostly addition,subtraction, division and

multiplication. Quite a few of

the questions focus on

percentage.


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Types of DataPresentation

Tables

Bar Graphs

Line Graphs

Pie Charts


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What Data Presentation

will you use for -

Satisfaction SurveysTables

Analysis of Fault CausesBar Charts


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Sales over last 5 yearsLine Chart

Market SharePie Chart


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RememberThe calculations required

seem quite complicated. So,

always approach the

questions in a phasedmanner.


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Step 1

Read the question

carefully, and find out

what exactly is asked.


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0

5

10

15

20

25

3035

40

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

In which

quartersthedifferencebetweenEast and

West isalmost the

same?


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OR

0

5

10

15

20

25

3035

40

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

In whichquarter the

differencebetween

East andWest is the

most?


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OR

0

5

10

15

20

25

3035

40

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

In whichquarter the

differencebetweenEast and

West is themost

negligible?


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Step 2

Write down the

calculations required in a

step-by-step manner.


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05

10

15

20

25

30

35

40

45

50

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

North

In which

quarter isthe

difference

between

East and

West 1/3rdof the total

for North?


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05

10

15

20

25

30

35

40

45

50

1st

Qtr

2nd

Qtr

3rd

Qtr

4th

Qtr

East

West

North

OR

In whichquarter do

East andWest add

almost upto the total

for North?


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Step 3Read the answer choices and

decide what level of calculations

are required - whether you need tocomplete the calculations to the last

decimal, or whether you can

approximate.

Most of the times, approximation

works beautifully.


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Find the percentage change

from 126.37 to 188.94Eliminate the options that

say there has been adecrease

Eliminate the options thatsay there has been an

increase of 100% or more.


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The answer will be around

50%, so select the option +

5% of this.

Most of the times, there will

be only one option in this

range.


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Tables


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DEATHS RATE /(numbers), 100,000

1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

Percentage of people killed in

accidents in 1970 is?


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1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

56.4 out of 100,000

i.e. 0.0564%


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1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

% change in falls between

1970 and 1980?


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1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

Approximately 17K to 13K,

which is close to 25%


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1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

What was the population in

1980?


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1970 1980 1970 1980Accident

114,638

105,718

56.4 46.7

Motor-vehicle

54,633

53,172

26.9 23.5

Falls 16,

926

13,

294

8.3 5.9

46.7 out of 100,000,

105,718 out of ------ (200 m)


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Bar Charts


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What is the increase in

prisoner pop/m 70 to 80?


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40 out of 100,000

Hence 400 out of 1 million


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Average annual % increase

between 1970 and 1980?


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Increase of 50% in 10 years,

hence 5% annual.


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Cumulative Bar

Charts


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% of farm m/c sold in 85 that

were 2WD tractors?


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Approximately 70%


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Total sales of combines in

all years?


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Approximately 50 thousand


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Pie Charts


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How many disabled people

in 1989?


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% change in survivors to

disabled ratio 70 to 89?


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Line Graphs


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What product was 400%

more than ply in 80?


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Increase in total

consumption from 70 & 85


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Average of Lumber between

70 and 85?


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When was the highest %

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