Saturday, 7 May 2016

DI Special For SBI PO

Data Analysis & Interpretation

Data Interpretation has always played a great role in selection for SBI PO. In Phase One exam also SBI has asked for Data Interpretation Questions in Quantitative Sections. SBI Online Phase 2 Exams will be having a complete 60 marks section devoted to Data Interpretation. 
Many Student face difficulty in tackling with DI section while some others are very efficient in Data Interpretation.
The best part of Data Interpretation is that this section can be mastered in very less time compared to other subjects such as Quantitative Section and English or General Awareness.

Now Let us come to the most Important Thing.

" Demystifying Data Interpretation

Look anyone can solve DI question, if there is no time limit given. But in Exam we are required to solve the question in limited Time.

Few Necessary Skills which are required for Mastering DI are Listed as below:

1.Read the data very carefully. Even the minutest word must not be overlooked since many a times even single word/group of words could become critical.
2.If there are more than one graphs/charts/tables, understand the relationship between them clearly before you proceed to solve the questioned asked.
3.Answer only the questions asked. Do not answer/calculate things which have not been asked for.
4.Be careful to use proper units and beware of charts and tables with non-uniform units.
5.Avoid simple calculation mistake and revise your answer at least once before moving to next question.

Tips to reduce calculation time
In DI most of the questions are usually based on percentage increase and decrease, ratios and averages. A simple trick for solving data interpretation problems quickly is:

  • Learn tables till 20.
  • learn fractions till 1/20 to improve your speed
  • Waste little time in finding averages: Here if you have to find averages for sales in branches B1 to B6 for the year 2014, use this shortcut:

                          What you usually do: [80+75+95+85+75+70]/6
                               Instead: 70 + [10+5+25+15+5]/6=70+ [60/6]= 80
      With this technique, you will reduce calculation time and are also bound to make fewer mistakes.

Types of Data Analysis & Interpretation

1. Tabular representation
2. Bar charts
3. Line Graphs
4. Pie  charts
5. Caselets
6. Spider charts
7. Missing DI
8. Miscellaneous charts.

We will now go on and analyse each of the types of charts.

Tabular Representation

Some important Tricks and Concepts generally used in tabular DI:
1. Average :
         Average =total of data/No.of data
For more Concept and Tricks on Average, Click Here

2. Percentage :
                 If we have to find y% of x, then 
                               y% of x=(x*y)/100
For more Concept and Tricks on Percentage, Click Here

3. Ratio & Proportion :
  • The ratio of a to b is written as a : b = a / b
  • The idea of proportions is that two ratio are equal.                                                           If a : b = c : d, we write a : b : : c : d
     For more Concept and Tricks on Ratio & Proportion, Click Here
The following exercise will help you to clearly understand Tables and the kind of questions that might be created on tables.

Ex-1: Directions (Q. 1-6): These questions are based on the following information regarding the price changes that a certain pharmaceutical company is considering for its products.

1. A man is prescribed a combination of Antacid and Anti-Hypertensive in the ratio 2 : 3 for the first week and of Anti-Hypertensive and Anti-Flatulent in the ratio 3 : 4 for the second week. The purchased all the medicines under the existing price. His expenditure in the second week is what % more than in the first week?
1) 24% more 
2) 18% less
3) 26% more 
4) 25% less
5) Data Inadequate

2. If a family has a hypertensive and an asthmatic patient, where the person with hypertension has to consume three tablets of Anti-Hypertensive per day and the asthmatic patient has to take two tablets of Anti-Asthmatic every alternate day, what will be the increase in expenditure on the two patients for 30 days?
1) Rs 37.50 
2) Rs 42.75 
3) Rs 46.50 
4) Rs 38.50
5) Rs 39.25

3. What is the percentage increase in the expenditure of a person for one year if he consumes 32 tablets of Antacid in one week?

4. A person is prescribed to take two spoonfuls of Expectorant thrice everyday for a period of 20 weeks. Assuming that each bottle of Expectorant contains 90 spoonfuls, find the expenditure according to the existing prices.
1) Rs 210 
2) Rs 200
3) Rs 168
4) Rs 240
5) Rs 220

5. In the question no. (1), average cost per tablet for the first week is what % less than the average cost per tablet for the second week?
1) 17.9% 
2) 17.02%
3) 24.5% 
4) 25.6%
5) Can’t say

Ex:2. Directions (Q. 6-10): Read the table and answer the questions that follows

Distribution of Students at Harvard University according to Professional Courses

6. If 60% of the boys and 70% of the girls are successful in the courses taken by them, then what is the combined pass percentage? (Approximately)
1) 65.9
2) 64.2
3) 62
4) 67
5) 66.8

7. In which course is the percentage of girls (among the total number of students) higher than the percentage of girls in any other course?
1) Business Management
2) Computers
3) finance
4) Others
5) Cannot be determined

8. By what percentage is the number of the students doing Computers more than the number of students doing Business Management?

9. The percentage of girls engineers doing Business Management are:
1) 11.2
2) 2.2
3) 15
4) 14
5) None of these

10. Talking all the courses together, by what percentage do the number of boys exceed the number of girls?
1) 521.4%
2) 421.4%
3) 321.4%
4) 221.4%
5) None of these

Answers with Explanation:

1. 4;  The constant present in the first week combination is either similar or different from the constant present in the second week combination. Hence we can’t find the expenditures of first and second weeks.
Hence data inadequate.

2. 1; Three tablets/day would mean the hypertensive has to be taken 90 times in 30 days.
    The increase is of Rs 2.50 for 10 tablets
             Hence increase will be of 2.50 × 9 = 22.50 for 90 tablets 
                    Asthmatic has to consume 30 tablets.
                    ∴ increase = 5.00 × 3 = 15.00
                    ∴ total increase = 22.50 + 15 = 37.50.

6.  c;  Take the Weighted average. 
                    Total number of boys=611
                    Total number of girls=145
                     So, Ratio of boys to girls= 611:145= 4.21:1≈4:1

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