question c for both pl,z
For the first one:
So it looks like as the age of a car goes up, its price and value come down. Logical, right? :D
a) We know that each point represents a car. Its x-value (i.e. how far away to the left or right it is from 0) is its age, and its y-value (i.e. how far away to the north or south it is from 0) is its cost.
If a car is 4 years old (it has an x-value of 4) and its price is 2,600 pounds (it has a y-value of 2600), where will the point representing the car go? Put the point there :D
b) When looking at a relation between the x and y values (in this case, the age and price of the car) in a scatter plot, we don't need to find some equation. We are looking for a correlation.
There are 3 situations:
In this problem, it looks like the price of a car comes down when its age increases (as we wrote in the first sentence xD).
Basically, every time x (the age) increases, y (the price) decreases. Now, what correlation does this remind you of? :D
c) I trust you can do this on your own, now that you know about correlations! Here, your answer doesn't need you to be specific: You can make up a value! Just make sure it doesn't too strongly resist the correlation you set in part (b) :D
Edit: oops, didn't know it was only question (c). Oh well, the more you know! xD
Are you sure? Hmm. With scatter plots, you can never really be accurate.