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and the coefficient of variation VN =-= 0.067 ©

and the coefficient of variation VN =-= 0.067 ©

The minimum coefficient of variation is 0.1, hence Vn = max(n , 0.l) = 0.1

With no prior knowledge of blow count (variance unknown)

Student's t-value for 95% confidence limit with (n - 1) degrees of freedom is t95(n - 1) = 1.782 ©

Hence statistical coefficient is kn = tgg(n - 1W — = 0.494

Characteristic blow count is then

Data from investigation B

Consider the results of the Standard Penetrations Tests from investigation B, given as: (blow count N, depth in m):

(9, -13m), (13, -14.5m), (13, -12.7m), (10, -14.5m), (6, -13m), (12, -14.5m), (14, -16m), (9, -17.5m), (15, -15m), (20, -16.5m), (23, -18m), (17, -19.5m), (12, -13m), (12, -14.5m), (8, -15.5m), (11, -17m), (17, -18.5m), (10, -13m),

(12, -14.5m), (9, -15.5m), (8, -17m), (15, -18.5m), (17, -20m), (13, -21.5m) ©

Statistical analysis of data The number of tests is n = 24

Sum and mean of SPT values are N = 305 and mN

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