University of Allahabad 2008 B.Com (Part-III) , Business Statistics - Question Paper

B.Com. (Part-III) Examination, 2008
Business Statistics
Paper: Thirteenth

Time Allowed: 3 Hours] [Maximum Marks: 100

Note: This paper is divided into part- 'A' and Part-'B'. Attempt all ques. from Part- 'A' and 3 ques. from Part-'B'. Use of calculator is prohibited.

Part-'A'
Note: Attempt all 8 ques.. ans in not more than 100 words. every ques. carries five marks.

1. elaborate the causes of distrust of statistics?
2. Write a note on stratified random sampling.
3. State the various kinds of bar diagrams.
4. What is probable error?
5. 25 students took-up a test, the outcomes of those who passed the test are provided beneath. If the avg. for all the students was 2.58 marks, obtain the avg. of those who failed.

Marks four five six seven eight 9
No. of students four five four seven two three

6. discuss variance and coefficient of variation.
7. elaborate the functions of Central Statistical Organization?
8. obtain the missing value in the subsequent data:

X nine three six 9
Y 60 ? 160 240
Part-'B'
Note: Attempt any 3 ques. in maximum 600 words. every ques. carries 20 marks.

9. A factory produces 2 kinds of electric lamps A and B. In an experiment relating to their life the subsequent outcomes were obtained:

Length of life No. of lamps
(in hours) A B
500-700 five 4
700-900 11 30
900-1100 26 12
1100-1300 10 8
1300-1500 eight 6
Compare the variability and consistency from the point of view of length of life using coefficient of variation.
10. obtain coefficient of correlation ranging from age and playing habits of the subsequent students:

Age : 15 16 17 18 19 20
No. of students : 125 100 75 60 50 40
11. From the subsequent data estimate the population for the year 1986. Using parabolic curve method:
Year : 1971 1981 1991 2001
Population (lakh) : 18 22 24 30
12. The age distribution of the member of a certain children's club is as follows:
Age in years : four five six seven eight nine 10 11 12
Frequency : five nine 18 35 four 32 15 seven 3
there is a member A such that there are twice as many members older than A as there are members younger than A. Estimate his age (in years upto 2 decimals).
13. Distinguish ranging from secular trend, seasonal variation and cyclical fluctuations. How would you measure secular pattern in any data?

Earning:   Approval pending.