Reference no: EM13580693

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:

X	1	2	3	4	5
Y	2	5	3	8	7

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.