B.M. DEGREE EXAMINATION, APRIL/MAY 2018.
Second Semester
BUSINESS STATISTICS
2 90423
Time 2.30 Hours Max. Marks 60
PART — A
Answer any TWO of the questions. 6 12 Marks)
1. What is a graphical representation? Explain any two graphs used in statistics.
2. What is arithmetic mean? Explain properties of A.M.
3. What is regression analysis? Explain various applications of regression in practice.
4. Explain the method of least square method of estimation.
PART — B
Answer any FOUR questions. 12 48 Marks)
5. What is classification of data? Explain different methods of classification.
6. Draw Ogive curve by less than and more than to the data given below
Marks 0 10 20 30 40 50 60 70
Students 40 30 24 21 19 14 12 8
7. Calculate mean and S.D of the following data
Marks 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99
No. of students 5 12 15 20 18 10 6 4
8. Find mean deviation from the following data
Marks 0-10 10-20 20-30 30-40 40-50 50-60 60-70 70-80 80-90 90-100
f 5 14 29 21 25 21 10 7 15 3
9. Calculate Pearson's co-efficient from the following data
x 1 2 3 4 5 6 7 8 9
y 9 8 10 12 11 13 14 16 15

10. The following table gives the aptitude test scores and productivity Indias of 10
workers selected at random.
Aptitude index 60 62 65 70 72 48 53 73 65 82
productivity index 68 60 62 80 85 40 52 62 60 81
Find out the two regression equations for the given data.
11. Determine the equation of a straight line which best fits the following data
Year 1974 1975 1976 1977 1978
Sales (in Rs'000) 35 56 79 80 40
12. What is a time series? What is the need to analyse a time series? Enumerate the
different methods of finding the secular trend.
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