Explain cyclic variations.

Discuss about irregular variation

Define seasonal index.

State the two normal equations used in fitting a straight line.

State the different methods of measuring trend.

Find the trend of production by the method of a five-yearly period of moving average for the following data:

Year	1979	1980	1981	1982	1983	1984	1985	1986	1987	1988	1989	1990
Production(‘000)	126	123	117	128	125	124	130	114	122	129	118	123

The following table gives the number of small-scale units registered with the Directorate of Industries between 1985 and 1991. Show the growth on a trend line by the free hand method.

Years	1985	1986	1987	1988	1989	1990	1991	1992
No. of units (in‘000)	10	22	36	62	55	40	34	50

The following table shows the number of salesmen working for a certain concern:

Year	1992	1993	1994	1995	1996
No. of salesmen	46	48	42	56	52

Use the method of least squares to fit a straight line and estimate the number of salesmen in 1997.

Define Index Number.

Write note on Fisher’s price index number.

State the test of adequacy of index number.

Define Time Reversal Test.

Explain Factor Reversal Test.

Define true value ratio.

Discuss about Cost of Living Index Number.