Scatter Plots That was easy Year # of Applications 1991 297 1993 331 1995 409 1996 482 1999 647 2000 615 The accompanying table shows the number of applications for admissions that a college received for certain years. Create a scatter plot that models this data. College Applications 700 600 500 400 300 200 100 # of Applications That was easy 1991 1993 1995 1996 1999 2000 Year

Scatter Plots on a Graphing Calculator Year # of Applications 1991 297 1993 331 1995 409 1996 482 1999 647 2000 615 Lets take another look at that chart. Let x = 1 represent 1991, x = 3 represent 1993 and so on so that x = 10 represents 2000. Store the data Press STAT ENTER Enter x values in L1 and corresponding y values in L2. Set up the Scatter Plot Press 2nd STAT PLOT ENTER ENTER Display the Scatter Plot Or press GRAPH Press ZOOM 9 That was easy

Comparing Correlation Coefficients and Trends in Scatter Plots As x increases, y increases. The closer r is to 1, the better a line fits the data and the stronger the linear relationship is. As x increases, y decreases. The closer r is to -1, the better a line fits the data and the stronger the linear relationship is. There is no significant linear relationship between x and y. The closer r is to 0, the weaker the linear relationship is. Positive Correlation No Correlation Negative Correlation

Another Scatter Plot Make a scatter plot using the given data and describe the relationship. Altitude and Temperature 60 50 40 30 20 10 Temperature The data has a negative correlation. 1000 2000 3000 4000 5000 Altitude

Draw scatter plots and describe the relationship Homework Page 341: 7 – 10 Draw scatter plots and describe the relationship