Blood Spatter Lab ― Development¶

Hypothesis Development¶

Prelimenary Hypotheses¶

1. How does disturbance affect moisture of blood?
2. How does the time since the body was found and blood was left (behind) affect blood moisture?

3. How does the 'nature of transfer' affect the shape of the bloodstain?

4. How does wind affect how tightly grouped the drops of blood surrounding the central point are?

Hypothesis Selection¶

Below is the elimation and selection of the final hypothesis, along with reason(s) for elimination.

1. Impractical for scale of experiment — needs much data, time, & resources

2. Dependent upon time alloted

3. Requires more equipment and materials
4. Dependent upon resources and materials available

Final Hypothesis¶

How does the time since the body was found and blood was left (behind) affect blood moisture?

Method¶

Independent Variable¶

IV: Time blood is left undisturbed.

Changing of IV: Have differed length between setting of blood and checking for moisture across trial groups.

№ IV Values: 10

Trials per IV Value: 8

Dependent Variable¶

DV: Blood Moisture

Method of Measurement: Resistive moisture sensor

Unit of Measurement: Kilohms (kΩ)

Recording of Qualitative Changes: Difference in kΩ between starting and ending condition.

Procedure¶

1. []

Equipment and Materials¶

Equipment and Materials¶