Question

The following data gives the production of bleaching powder (in ’000 tons) for the years 1962 to 1972:

Year	1962	1963	1964	1965	1966	1967	1968	1969	1970	1971	1972
Production	0	0	1	1	4	2	4	9	7	10	8

Obtain the trend values for the above data using 5-yearly moving averages.

Answer 1

We construct the following table to obtain 5-yearly moving averages for the given data:

Year (t)	Production (in ’000 tonnes) (xt)	5-yearly moving total	5-yearly moving averages Trend value
1962	0	-	-
1963	0	-	-
1964	1	6	1.2
1965	1	8	1.6
1966	4	12	2.4
1967	2	20	4.0
1968	4	26	5.2
1969	9	32	6.4
1970	7	38	7.6
1971	10	-	-
1972	8	-	-