table. If the is larger than the tabulated values, then the correlation is significant. “t-stat” In this latter test the is the ratio of the absolute value of (slope 0)/( standard error “t-stat” – of slope). You are using the student-t test to see whether the slope is significantly different from zero. Figure (1) shows a plot of Pressure Drop versus Gas Velocity and the straight line relationship. Table (1) Pressure Drop versus Gas Velocity Data X Y Gas Velocity Pressure Drop ft/sec inches water 1 4 2 5 3 7 4 8 5 6 6 9 7 11 8 10 9 14 10 15 Table (2) Regression Analysis Results SUMMARY OUTPUT Regression Statistics Multiple R 0.946219042 0.895330476 Adjusted 0.882246785 Standard Error 1.257703535 Observations 10 ANOVA Significance df SS MS F F Regression 1 108.2454545 108.245455 68.4310345 3.43E-05 Residual 8 12.65454545 1.58181818 Total 9 120.9 Standard Coefficients Error t Stat P-value Lower 95% Upper 95% Intercept 2.6000 0.8592 3.0262 0.0164 0.6187 4.5813 X Variable 1 1.1455 0.1385 8.2723 0.0000 0.8261 1.4648
table. If the “t-stat” is larger than the tabulated values, then the correlation is significant. In this latter test the “t-stat” is the ratio of the absolute value of (slope – 0)/( standard error of slope). You are using the student-t test to see whether the slope is significantly different from zero. Figure (1) shows a plot of Pressure Drop versus Gas Velocity and the straight line relationship. Table (1) Pressure Drop versus Gas Velocity Data X Y Gas Velocity Pressure Drop ft/sec inches water 1 4 2 5 3 7 4 8 5 6 6 9 7 11 8 10 9 14 10 15 Table (2) Regression Analysis Results SUMMARY OUTPUT Regression Statistics Multiple R 0.946219042 0.895330476 Adjusted 0.882246785 Standard Error 1.257703535 Observations 10 ANOVA df SS MS F Significance F Regression 1 108.2454545 108.245455 68.4310345 3.43E-05 Residual 8 12.65454545 1.58181818 Total 9 120.9 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 2.6000 0.8592 3.0262 0.0164 0.6187 4.5813 X Variable 1 1.1455 0.1385 8.2723 0.0000 0.8261 1.4648
f18%20Labguide2.docx