STANDARD: 8.SP.1 STATISTICS AND PROBABILITY: SCATTER PLOTS.

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Presentation transcript:

STANDARD: 8.SP.1 STATISTICS AND PROBABILITY: SCATTER PLOTS

SCATTER PLOTS Review: A variable is a trait or quantity whose value can change or vary. A coordinate plane using the horizontal x axis and the vertical y axis Generate points on a coordinate plane by graphing an x value, then y value on the coordinate plane.

SCATTER PLOTS One variable data: a data set that contains measures of only one trait or quantity Two variable data : data that contains measures of ________ traits to try to find a relationship. Scatter plot : a graph that displays the ____________ data in a graphic form.

SCATTER PLOTS Once a scatterplot has been graphed, the information on the graph can then be interpreted. Illustration of scatter plots with various properties: (a) 'shotgun' scatter, with low association, (b) strong positive association, (c) strong negative association, (d) and (e) low association, with very little change in one variable compared with the other,

SCATTER PLOTS Some graphs have linear associations, and some have non linear associations. Which is which? Why?

SCATTER PLOT Some graphs have points that seem not to belong to the graph. They do not offer a positive, negative, linear or non linear association. They are called OUTLIERS.

SCATTER PLOTS Some two variable graphs bunch up together…this is called a cluster.

SCATTER PLOTS What do you notice?

SCATTER PLOTS What do you notice?

SCATTER PLOTS

SCATTER PLOTS Student Math Science Example 1: Data for 10 students’ Math and Science scores are provided in the chart. Describe the association between the Math and Science scores.

SCATTER PLOTS Example 2: Data for 10 students’ Math scores and the distance they live from school are provided in the table below. Describe the association between the Math scores and the distance they live from school. Student Math Distance from School (miles)

SCATTER PLOTS Number of Staff Average time to fill order (seconds) Example 3: Data from a local fast food restaurant is provided showing the number of staff members and the average time for filling an order are provided in the table below. Describe the association between the number of staff and the average time for filling an order.

SCATTER PLOT Date Life Expectancy (in years) Example 4: The chart below lists the life expectancy in years for people in the United States every five years from 1970 to What would you expect the life expectancy of a person in the United States to be in 2010, 2015, and 2020 based upon this data? Explain how you determined your values.

SCATTER PLOT Today, in a group of 2-3, 1) choose two variables to investigate and see if they have a relationship 2) Find at least 10 examples 3) organize your data into a table, 4) GRAPH the data, and 5) answer the following questions A) What two variables are you measuring and comparing? B) What is the data you recorded (as a table) C) What does the data look like after graphing it? D) What does the data tell you? Are there any patterns/associations/clustering/or outliers? Ask one question to a random student in class.