Fit a straight line trend for the following data using the method of least squares.

x	0	1	2	3	4
y	1	1	3	4	6

Fit a trend line to the following data by graphic  method.

Year	1978	1979	1980	1981	1982	1983	1984	1985	1986
Production of steel	20	22	24	21	23	25	23	26	25

Find a trend line to the following data by the method of sami-averages.

Years	1980	1981	1982	1983	1984	1985	1986
Sales	102	105	114	110	108	116	112

Calculate the seasonal indices for the following data by the method of simple average.

Year	Quarters
	I	II	III	IV
1994	78	66	84	80
1995	76	74	82	78
1996	72	68	80	70
1997	74	70	84	74
1998	76	74	86	82

Compute Fisher's price index number for the following data.

Commodity	Base Year		Current Year
	Price	Quantity	Price	Quantity
A	10	12	12	15
B	7	15	5	20
C	5	24	9	20
D	16	5	14	5