Scatter plotsScatter plots are used to show relationship between two sets of data by writing them as ordered pairs To illustrate, let us pretend that you have a business that sells notebooks Day 1, you sell 10 notebooks Day 1, you sell 10 notebooks Day 2, you sell 5 notebooks Day 3, you sell 15 notebooks Day 4, you sell 10 notebooks Day5 , you sell 20 notebooks Day 6, you sell 15 notebooks Day 7, you sell 30 notebooks Day 8, you sell 15 notebooks Day 9, you sell 25 notebooks Day 10, you sell 15 notebooks You can display this situation with ordered pairs as shown below: (1,10), (2,5), (3,15), (4,10), (5,20), (6,15), (7,30), (8,15), (9, 25), and (10, 15) Then we can put the ordered pairs on the coordinate system. The resulting graph is called a scatter plot or scatter graph. Notice how the points are scattered around and everything is located in the first quadrant Two sets of data can form 3 types of relationships When y increases as x increases, the two sets of data have a positive correlation Basically, when you closely examine the graph, you will see that the graph has a tendency to go upward Example When y decreases as x increases, the two sets of data have a negative correlation Basically, when you closely examine the graph, you will see that the graph has a tendency to go downward Example When x and y are not related, we say that the two sets of data have no correlation Example 




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