In order to verify the model, a significance test was performed for the differences between the calculated and measured values of torque requirement in particular repetitions, for the different positions of the working element. Based on the Student’s t-test it was found in all cases that at a significance level a = 0.05 there was no ground for rejection of a null
hypothesis for the mean value of differences between the measured and calculated results (Table 3). Besides,
a conformity test was performed between particular measurement results and their theoretical values. The a and b coefficients of linear regression were determined in the form with a hypothesis that the condition H0: a = 0, b = 1 is fulfilled at conformity of the results. This hypothesis was tested with the transformed equation (Elandt,
1964) of the form:
where SSR is the sum of squares for regression, SSE is the sum of squares for error, n is the number of measurement points. The obtained values are presented in Table 3. All the test values indicate close conformity of the
theoretical model with a set of measurement results obtained from the empirical experiment.