Proving Polluted Ponds
Here's the data from the 10 ponds, the way it was collected:
How can you use this data to support your claim that pollution hurts fish?
First, you could take averages for the polluted vs. clean ponds. Try that now:
On average, how many fish are in the clean ponds, and how many in the polluted ponds.
- I need a hint: DO NOT calculate an average for all 10 ponds!
- ... another hint ... : DO calculate an average for the 5 clean ponds
- ... clean ponds ... : The average is (100+400+300+450+550)/5 = 1800/5...
- ... and the polluted ponds ...: do the same for the polluted ponds
I think I have the answer: 360 fish in clean ponds, 110 in polluted ponds
So the averages make a pretty strong case that clean water is better for fish. What if you need some graphical backup? Which of these 2 graphs below would be better?
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