1. Distinguish between Classification and Tabulation of data. What are the types of Classification of data?
2. Calculate mean and median for the following data
|
Marks
|
0-20
|
20-40
|
40-60
|
60-80
|
80-100
|
100-120
|
120-140
|
|
No of Students
|
4
|
26
|
22
|
10
|
9
|
6
|
3
|
3. Calculate the regression equations of X on Y and Y on X from the following data:
4. What is sampling? Briefly explain the various methods of sampling.
5. A company appoints four salesmen, A, B, C and D, and observes their sales in three seasons- summer, winter and monsoon. The figures ( in lakhs) are given in the following table:
|
Season
|
Salesman
|
|
A
|
B
|
C
|
D
|
Total
|
|
Summer
|
36
|
36
|
21
|
35
|
128
|
|
Winter
|
28
|
29
|
31
|
32
|
120
|
|
Monsoon
|
26
|
28
|
29
|
29
|
112
|
|
Total
|
90
|
93
|
81
|
96
|
360
|
|
|
|
|
|
|
|
|
|
|
Carry out an analysis of variance at 5% level of significance.
6. The mean wage is Rs. 75 per day, SD wage is Rs 5 per day for a group of 1000 workers and the same is Rs 60 and Rs 4.5 for the other group of 1500 workers. Find mean and standard deviation for the entire group.