Let's analyze the provided data step-by-step to determine the correct conclusion.
We have two fish tanks, Tank 1 and Tank 2, both treated with 10 mL of water purifier:
- Tank 1 was heated to [tex]$88^{\circ}F$[/tex].
- Tank 2 was kept at room temperature.
The water purity levels, measured in particles per liter over 5 weeks, are as follows:
| Week | Water Purity of Tank 1 | Water Purity of Tank 2 |
|------|-------------------------|-------------------------|
| 1 | 12.6 | 12.6 |
| 2 | 16.0 | 13.9 |
| 3 | 17.2 | 14.4 |
| 4 | 18.7 | 15.8 |
| 5 | 19.6 | 17.6 |
Step-by-Step Analysis:
1. Initial Purity (Week 1):
- Both tanks start with the same water purity of 12.6 particles per liter.
2. Second Week Purity:
- Tank 1: 16.0 particles per liter
- Tank 2: 13.9 particles per liter
3. Third Week Purity:
- Tank 1: 17.2 particles per liter
- Tank 2: 14.4 particles per liter
4. Fourth Week Purity:
- Tank 1: 18.7 particles per liter
- Tank 2: 15.8 particles per liter
5. Fifth Week Purity:
- Tank 1: 19.6 particles per liter
- Tank 2: 17.6 particles per liter
Observation:
- The water purity in both tanks shows an increase over the five weeks, indicating the effects of the water purifier.
- However, the increase in water purity in Tank 1 (heated to [tex]$88^{\circ} F$[/tex]) is more pronounced than in Tank 2 kept at room temperature.
Conclusions Based on Data:
1. "Fish need 10 mL of water purifier to survive."
- The provided data does not give any information about fish survival, only water purity.
2. "Fish tanks with purifier become cloudy in heated water."
- The data indicates increased water purity (i.e., it becomes clearer, not cloudier) in the heated tank.
3. "Water purifier can help a fish survive longer."
- The data does not provide direct evidence on fish survival, only effects on water purity.
4. "Water purifier keeps fish tanks clearer for longer."
- This conclusion aligns well with our observations. Both tanks show increased water purity, but Tank 1 (heated) shows a more significant increase, suggesting that the water purifier is effective at maintaining clarity for a longer period.
Correct Conclusion:
Water purifier keeps fish tanks clearer for longer.
