B.B.M-B.B.M BUSINESS STATISTICS (Alagappa University - Directorate of Distance Education-2012)
Friday, 21 June 2013 11:50Jebaprincy
B.B.M. DEGREE EXAMINATION, MAY 2012.
BUSINESS STATISTICS
Time : Three hours Maximum : 100 marks
PART A — (5 × 8 = 40 marks)
Answer any FIVE questions.
All questions carry equal marks.
1. What are the limitations of Statistics?
2. Explain the term ‘Skewness’. Give any two measures of skewness.
3. Draw a ‘Scatter diagram’ and explain its uses.
4. Explain the ratio to Moving Average method.
5. In a frequency distribution, the skewness based upon quartiles is 0.6. If the sum of the upper and lowerquartiles is 100 and the median 38, find the value of the
upper quartile.
6. What do you understand by skewness? Explain its various methods.
7. The AM calculated from the following frequency distribution is known to be 67.5 inches. Find the missing frequency.
Heights in inches : 60-62 63-65 66-68 69-71 72-74
Frequency : 15 54 9 81 24
8. Estimate v2 from the following :
x : 1 2 3 4 5
vx : 7 – 13 21 37
PART B — (4 × 15 = 60 marks)
Answer any FOUR questions.
All questions carry equal marks.
9. What is meant by Central tendency? Describe the various methods of measuring it and point out the usefulness of each method.
10. Explain briefly the various methods of determining trend in a time series.
11. Discuss the various uses and applications of index numbers.
12. Find the median for the following frequency distribution.
Number of days absent Number of students
Less than 5 29
Less than 10 224
Less than 15 465
Less than 20 582
Less than 25 634
Less than 30 644
Less than 35 650
Less than 40 653
Less than 45 655
13. Find out Bowley’s coefficient of skewness for the following data :
Weight (in kgs) more than : 40 50 60 70 80 90
No. of persons : 185 167 132 82 38 12
14. Find the coefficient of correlation between industrial production and export using the following data and comment on the result.
Product (in crore tons) : 27 28 29 30 32 32 33
Exports (in crore tons) : 17 18 19 19 21 20 21
15. The following table gives the normal weight of a baby during the six months of life.
Age in months : 0 2 3 5 6
Weight in lbs : 5 7 8 10 12
Estimate the weight of a baby at the age of 4 months.
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