The Effects of Atmospheric Pressure on a Baseball

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Presentation transcript:

The Effects of Atmospheric Pressure on a Baseball Kelly Grissom

Data Used Home runs Average Home Run Distance Maximum Home Run Distance 5 years (2012-2016)

Correlation Home Runs and Pressure r-value: -0.1746 p-value: 0.0326 CI: [-0.0148 -0.3258] Average Home Run Distance and Pressure r-value: -0.5309 p-value: 9.3068*10-6 CI: [-0.4051 -0.6369] Maximum Home Run Distance and Pressure r-value: -0.3586 p-value: 6.6231*10-6 CI: [-0.2104 -0.4906]

Bootstrap Correlation Home Runs and Pressure r-value: -0.1638 CI = [-0.0062 -0.3213] Average Home Run Distance and Pressure r-value: -0.5241 CI = [-0.3756 -0.6725] Maximum Home Run Distance and Pressure r-value: -0.3511 CI = [-0.1649 -0.5373]

Least-Squares Regression Slope: -0.002 CI width: 139.5 home runs Slope: -0.0012 CI width: 23.3 meters Slope: -0.0014 CI width: 45.6 meters

Bootstrap LS Regression CI = [-3.2152*10-5 -0.0038] CI = [-8.25*10-4 -0.0015] CI = [-7.66*10-4 -0.002]

Residual Analysis Chi2 Test Critical Value = 18.307 Home Run Calculated Value = 16.5622 Residuals Distributed Normally Average Distance Calculated Value = 9.7486 Maximum Distance Calculated Value = 21.4506 Residuals NOT Distributed Normally

Periodicity

Home Runs and Temperature 4 teams at different elevations Philadelphia (≈ sea level) Cleveland (≈ 500 ft. above sea level) Atlanta (≈ 1000 ft. above sea level) Colorado (Denver ≈ 5000 ft. above sea level)

Temperature Periodicity All display periodicity of approximately 1 baseball season

CPSD

Conclusions Pressure does affect the distance a baseball travels. Average home run distance: 75 ft. Maximum home run distance: 87 ft. Some evidence that pressure affects the number of homeruns hit, but may not be most important factor. Number of home runs: 125 Other factors may include humidity and distance of the fence from home plate. Colorado: 2nd longest distance to left field fence 3rd longest distance to center field fence 2nd longest distance to right field fence

Questions?