![]() ![]() Here we use linear interpolation to estimate the sales at 21 ☌. She then had their body mass index (BMI) measured. Making a scatter plot of a data set: A teacher surveyed her students about the amount of physical activity they get each week. When you draw a scatter plot, it doesn’t matter which variable goes on the x-axis and which goes on the y-axis. A scatter plot is a graph with points plotted to show a relationship between two sets of data. Interpolation is where we find a value inside our set of data points. A scatter plot indicates the strength and direction of the correlation between the co-variables. Example: Sea Level RiseĪnd here I have drawn on a "Line of Best Fit". Try to have the line as close as possible to all points, and as many points above the line as below.īut for better accuracy we can calculate the line using Least Squares Regression and the Least Squares Calculator. Homework 3 - Plug the slope m 3 and the y-intercept b -4 into the slope-intercept formula. Homework 2 - Plug (1, 2) and (0, -6) into the slope formula. Homework 1 - A trend line roughly describes the relationship between two variables in a set of data. We can also draw a "Line of Best Fit" (also called a "Trend Line") on our scatter plot: Time to mathematically breakdown the trends on lines. ![]() It is now easy to see that warmer weather leads to more sales, but the relationship is not perfect. Here are their figures for the last 12 days: Ice Cream Sales vs TemperatureĪnd here is the same data as a Scatter Plot: The local ice cream shop keeps track of how much ice cream they sell versus the noon temperature on that day. Share through email Share through twitter Share through linkedin Share through facebook Share through pinterest File previews. (The data is plotted on the graph as " Cartesian (x,y) Coordinates") Example: This worksheet is designed to give students an introduction to the concept of correlation, and it has them problem-solve with a problem requiring a scatterplot. In this example, each dot shows one person's weight versus their height. Worksheet by Kuta Software LLC Find the slope-intercept form of the equation of the line that best fits the data. A Scatter (XY) Plot has points that show the relationship between two sets of data.
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