Find the value of N if the sums of squares of two individual residuals are given as 24.98 and 13.76 respectively. The summation of the difference between individual and the mean of the readings is 3.32 for 8 observations.

Find the value of N if the sums of squares of two individual residuals are given as 24.98 and 13.76 respectively. The summation of the difference between individual and the mean of the readings is 3.32 for 8 observations. Correct Answer 1.6

By applying the principle of least squares the value of N can be determined by, ∑rꞌ2 = ∑r2 + n*(N-(∑V/n))2. On substitution, we get 24.98 = 13.76 + 8*(N-(3.32/8))2 N = 1.6.
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