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QUESTION ONE
The following data relate to annual production in a fertilizer factory ( in thousand tons)
Year(t); 1977, 1978, 1979, 1980, 1981, 1982,1983,
Production; 70, 75, 90, 91, 95, 98, 100. where year(t) match with production respectively.
i)Find the value of x,where x=t−1980in each year
ii)Fit a linear trend by the method of least square and estimate the trend values
iii)Estimate the trend value of 1985



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