I fixed the animation. Two rules of thumb: All images “fade” in (see tutorial on animation) All letters appear letter-by-letter the first time. Hook

Test score Homework completed 100 90 80 70 60 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 Test score A scatterplot is a picture of a collection of two pieces of data. We construct a scatterplot by graphing collected data on a coordinate plane. It helps us to see if there is a relationship between two variables. In this scatterplot, we are viewing the relationship between homework assignments completed and test scores. The x-coordinate represents the number of homework assignments completed and the y-coordinate represents the test score on that material. Generally speaking, we can say that as the number of homework assignments increases, the test score increases.

Letters in Last Name Homework completed 10 9 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 9 10 Letters in Last Name A common mistake is assuming that all scatter plots will have clustering or that all will have outliers. This is not the case. Some scatter plots will just have clustering with no outlier or it may have no clustering AND no outlier.

Test score Homework completed 100 90 80 70 60 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 Test score Do you notice anything about the points on this graph? I notice that the points “cluster” in an upward pattern. A cluster of points are located close together in a tight pattern.

Test score Homework completed 100 90 80 70 60 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 Test score We have noticed a cluster in our data, what does that really mean? A tight cluster that form a certain shape (such as a line or a curve) tell us how strong the relationship is. The tighter the cluster, the stronger the relationship. This graph tells us that there is a strong association between number of homework assignments completed and the test score on that material.

Test score Homework completed 100 90 80 70 60 50 40 30 20 10 1 2 3 4 5 6 7 8 9 10 Test score What does it mean if there are points that lie outside of the cluster? This point is called an outlier.

We have identified an outlier, now what? We need to speculate the reason for the outlier. An outlier could result from an error in data collection OR it can tell us important information. Let’s look at the outlier in this data. The outlier shows that a student completed all 10 homework assignments, but they only made a 60 on the test. Let’s think of some possible reasons for this? Maybe this student, did their homework, but never understood their mistakes? Maybe this student, did their homework, but had test anxiety? OR maybe this student erroneously reported that they did all 10 homeworks? It is important to understand the significance of an outlier when analyzing data.

We have constructed a scatterplot by graphing data We have constructed a scatterplot by graphing data! Even though there was one exception, all of the other data points indicated that we have looked at this data and we can make a generalization that yes we should be doing more homework if we want to get a higher grade on our tests!

Box any outliers if found. Hours watching TV Test score 100 90 80 70 60 50 40 30 20 10 1 2 3 4 5 Circle and describe the pattern of the cluster of points in this graph. Box any outliers if found. The data point cluster in a downward pattern. This means that test score decrease as hours of watching TV increases. There is one outlier in this data.

This is designed for the student who has interpersonal learning style This is designed for the student who has interpersonal learning style. The student gets to interact with other students with a constructive purpose. The student will then take this real life data, construct a scatter plot, note the patterns of clustering, note any outliers and draw conclusions based on these observations. Some possible topics could be: the number of hours you watched TV last night vs. your bed time The amount of time you studied for your last test and the test score The number of songs on your IPOD/MP3 player and the average amount of time that you listen to music daily The amount of time that you watch tv daily vs. the amount of time you listen to music daily

This activity is designed for your investigative students This activity is designed for your investigative students. They can find information in a newspaper (or online) and construct a scatterplot and identify the patterns (clustering and outliers). They can also speculate the meaning of these observations.

Number of songs downloaded 20 18 16 14 12 10 8 6 4 2 Graphs and answer choices will have to be generated. A possible reason for the outlier is that this person may have had a coupon for some free songs and didn’t have to use their card.