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The 10 rainy days had a total of 285 °C, and the 20 dry days a total of 637 °C.
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The rainy days had a total of , and the dry days a total of .
- Find the mean temperature of each group, and the difference.
- A student says that rain makes the temperature fall. Is that proved?
Need a reminder? The key ideaShow
The month, in degrees Celsius: , , , , , . It rained on days , to and to . An association between two things is not proof that one causes the other.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. Means. Rainy: . Dry: .
Step 2. Difference. .
Step 3. Is it proved? No. The rainy days were cooler, but clouds may cause both the rain and the cooling. The data shows an association, not a cause.
Answer: and , a difference of ; not proved.
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