Scatter plots & Trend Lines

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Presentation transcript:

Scatter plots & Trend Lines Chapter 4 Section 5 Scatter plots & Trend Lines

Scatter plot Is a graph with points plotted to show a possible relationship between two sets of data. A scatter plot is an effective way to display some types of data.

Graphing a Scatter plot Put in your notes Make sure to give the graph a title Label x & y. Label the x & y axis The scale for the x & y can be different scales For example on the x-axis you could go up by 1’s and on the y-axis you could by 5’s. Plot the ordered pairs

Let’s Practice Make a scatter plot of the following data in your notes:

Scatter plot of Increase in List

Try one more Graph the Football data in your notes packet

Scatter plot of Games

Correlation Describes a relationship between two data sets. A graph may show the correlation between data.

Correlations

Describing Correlations from Scatter plots Describe the correlation Negative Correlation

Describing Correlations from Scatter plots 2) Describe the correlation Positive Correlation

Identifying Correlations Describe the Correlations: 3) The number of empty seats in a classroom and the number of students you would expect to see. You would expect to see a negative correlation. As the number of students increases, the number of empty seats decreases.

Identifying Correlations Describe the Correlations: 4) The number of pets a person owes and the number of books that person read last year. You would expect to see no correlation. The number of pets a person owns has nothing to do with how many books the person has read.

Identifying Correlations Describe the correlation 5) The monthly rainfall and the amount of water in a reservoir. You would expect to see a positive correlation. As more rain falls, there is more water in the reservoir.

Identifying Correlations Describe the correlation 6) The temperature in Houston and the number of cars sold in Boston. No Correlation

Identifying Correlations Describe the correlation 7) The number of members in a family and the size of the family’s grocery bill. Positive Correlation

Identifying Correlations Describe the correlation 8) The number of times you sharpen your pencil and the length of your pencil. Negative Correlation

Complete Practice 4 -5 To be collected Check your answer with the substitute

Homework due Tuesday Page 266: # 1-12 (To be collected tomorrow) You will need graph paper for your homework to create the scatter plot Core Ethical Value Typed Essay due on Thursday

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