3. Results
The results of our experiment are as shown below:
Table 1: Table of killzone readings against the types of killing agents used.
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Measurements of the dependent variable: Kill zone
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Independent Variable
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Reading 1 (cm^2)
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Reading 2 (cm^2)
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Average Reading (cm^2)
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Remarks
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1 Clorox
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Day 1: 0.50
Day 2: 4.91
Day 3: 3.46
Day 4: 3.14
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Day 1: 0.50
Day 2: 3.46
Day 3: 2.27
Day 4: 1.77
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Day 1: 0.50
Day 2: 4.19
Day 3: 2.86
Day 4: 2.71
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Overtime, the chlorine in the Clorox will evaporate, causing the killzone to be smaller.
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2 Mama Lemon
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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The results prove that this killing agent is not effective.
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3 Jif
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.64
Day 4: 0.50
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.57
Day 4: 0.50
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The results prove that this killing agent is not effective.
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4 Mr Muscle
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Day 1: 0.50
Day 2: 3.14
Day 3: 2.54
Day 4: 2.27
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Day 1: 0.50
Day 2: 2.15
Day 3: 1.33
Day 4: 0.86
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Day 1: 0.50
Day 2: 2.65
Day 3: 1.94
Day 4: 1.57
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This killing agent is effective in killing germs, but the chemicals will slowly be lesser overtime.
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5 Dettol
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Day 1: 0.50
Day 2: 2.01
Day 3: 0.95
Day 4: 2.01
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Day 1: 0.50
Day 2: 0.79
Day 3: 0.64
Day 4: 0.64
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Day 1: 0.50
Day 2: 1.40
Day 3: 0.80
Day 4: 1.33
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This killing agent is effective in killing germs, but the chemicals will slowly be lesser overtime.
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6 Control Variable
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
|
Day 1: 0.50
Day 2: 0.50
Day 3: 0.50
Day 4: 0.50
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As it is the control variable, it is not surprising that all the results are at the bare minimum.
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(Even though some of the killing agents listed above were not effective even though they have a killzone, 0.5cm^2 is the area of a paper disk, hence we cannot tell whether bacteria grew underneath it, which
concludes that 0.5cm^2 is the minimum killzone. Also, all data are rounded up to 3 significant figures.)
Table 2: Table of killzone readings against the concentrations of Clorox used.
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Measurements of the dependent variable
|
|
Independent Variable (Clorox)
|
Reading 1 (cm^2)
|
Reading 2 (cm^2)
|
Average Reading (cm^2)
|
Remarks
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1. ⅕ concentration
1 : 4
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Day 1: 0.50
Day 2: 0.64
Day 3: 0.58
Day 4: 0.95
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Day 1: 0.50
Day 2: 0.79
Day 3: 0.64
Day 4: 0.64
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Day 1: 0.50
Day 2: 0.72
Day 3: 0.61
Day 4: 0.88
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The results show that this concentration is not that effective in killing bacteria compared to the undiluted one.
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2. ⅖ concentration
2 : 3
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Day 1: 0.50
Day 2: 1.77
Day 3: 1.13
Day 4: 1.77
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Day 1: 0.50
Day 2: 2.27
Day 3: 1.77
Day 4: 1.33
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Day 1: 0.50
Day 2: 2.02
Day 3: 1.45
Day 4: 1.55
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The results show that this concentration is effective in killing bacteria.
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3. ⅗ concentration
3 : 2
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Day 1: 0.50
Day 2: 3.46
Day 3: 2.54
Day 4: 2.54
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Day 1: 0.50
Day 2: 2.27
Day 3: 1.77
Day 4: 1.54
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Day 1: 0.50
Day 2: 2.87
Day 3: 2.16
Day 4: 2.00
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The results prove that this concentration is very effective in killing bacteria.
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4. ⅘ concentration
4 : 1
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Day 1: 0.50
Day 2: 3.8
Day 3: 2.27
Day 4: 2.54
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Day 1: 0.50
Day 2: 2.84
Day 3: 1.77
Day 4: 1.54
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Day 1: 0.50
Day 2: 3.32
Day 3: 2.02
Day 4: 2.00
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The results prove that this concentration is very effective in killing bacteria, close to the undiluted one.
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5. Undiluted
5 : 0
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Day 1: 0.50
Day 2: 4.91
Day 3: 3.46
Day 4: 3.14
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Day 1: 0.50
Day 2: 3.46
Day 3: 2.27
Day 4: 1.77
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Day 1: 0.50
Day 2: 4.19
Day 3: 2.86
Day 4: 2.71
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Overtime, the chlorine in the Clorox will evaporate, causing the killzone to be smaller.
|
(Even though some of the killing agents listed above were not effective even though they have a killzone, 0.5cm^2 is the area of a paper disk, hence we cannot tell whether bacteria grew underneath it, which
concludes that 0.5cm^2 is the minimum killzone. Also, all data are rounded up to 3 significant figures.)
Figure 1: Histogram of the area of the killzone in the petri dish for different soaps used.
Figure 2: Histogram of the probability of the kill zones in the petri dish for each of the concentrations of Clorox against a period of 4 days.
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