Alex Helbsing
Whit Duncan
Agenda
 Problem Definition
 Experimental Design
 Experimental Procedure
 Results
 Conclusion
Problem Definition
 In baseball it is desirable to hit the ball as far as
possible.
 Players will illegally modify bats with cork, or
sometimes tennis balls.
 Place tennis balls inside aluminum bats to see if the
baseball will travel farther.
Experimental Design
 Experiment Factor:
 Tennis Balls Inside Bat

Treatment Levels: 0, 1, 2
 Blocking Factor:
 Three Different Batters
 Response Variable: Distance(ft)
 Number of Replications: n=6
The Bats
Bats
Bat with 2 Balls Inside
Experimental Design
• Randomized Complete Block Design
Experimental Procedure
 Setup:
 Put sticks in ground labeled with batter and
number of tennis balls
Setup
Procedure:
 Step 1: Helper
hands bat to
batter.
 Step 2: The batter
hits the ball.
 Step 3: Person in
outfield places
stake in ground.
 Step 4: Every nine
hits the distances
were measured
and recorded. This
gave the batters a
break in between
hits.
Batters:
Alex: Batter 1
Whit: Batter 2
Dan: Batter 3
Results
 ANOVA Table
Analysis of Variance for Distance, using Adjusted SS
for Tests
Source
Balls
Batter
Error
Total
DF
2
2
49
53
Seq SS
519.4
12308.9
20343.0
33171.2
Adj SS
519.4
12308.9
20343.0
Adj MS
259.7
6154.4
415.2
F
0.63
14.82
P
0.539
0.000
Results: Residuals Plot
 Residuals
Results
•Farthest Distance: 1 Ball. However still insignificant.
•Batter three was the best batter.
Results
 Tested the response vs. each batter
Batter 1:
Analysis of Variance for 1 Distance, using Adjusted SS for Tests
Source
1 Balls
Error
Total
Batter 2:
Seq SS
126.9
4633.9
4760.8
Adj SS
126.9
4633.9
Adj MS
63.4
308.9
F
0.21
P
0.817
Analysis of Variance for 2 Distance, using Adjusted SS for Tests
Source
2 Balls
Error
Total
Batter 3:
DF
2
15
17
DF
2
15
17
Seq SS
286.9
2554.6
2841.5
Adj SS
286.9
2554.6
Adj MS
143.4
170.3
F
0.84
P
0.450
Analysis of Variance for 3 Distance, using Adjusted SS for Tests
Source
3 Balls
Error
Total
DF
2
15
17
Seq SS
225.5
13034.5
13260.1
Adj SS
225.5
13034.5
Adj MS
112.8
869.0
F
0.13
P
0.879
Conclusions
 Placing tennis balls inside will not help a player hit the
ball out of the park!
 Other Factors:
 Different types of tennis balls
 Different types of bats
 Experience level of batters