2017­4­17 scatter plots day 1.notebook
Today Is Monday
4/17/17
Do Now:
-Take a seat
-No calculator today
-Copy HW
-Intro Scatterplots WS
Today's Objective:
Introduction to Scatter Plots
April 17, 2017
2017­4­17 scatter plots day 1.notebook
Scatter Plots
Scatter Plot- graph used to determine
whether there is a relationship two
data sets. The data sets are graphed
as ordered pairs.
*A scatter plot
shows trends in data
Example:
The scatter plot shows the amounts of fat (in grams) and the numbers of calories in 12 restaurant sandwiches.
a. How many calories are in the sandwich that contains 17 grams of fat?
b. How many grams of fat are in the sandwich that contains 600 calories?
c. What tends to happen to the number of calories as the number
of grams of fat increases?
April 17, 2017
2017­4­17 scatter plots day 1.notebook
April 17, 2017
WHAT IF? A sandwich has 650 calories. Based on the scatter plot in Example 1, how many grams of fat would you expect the sandwich to have? Explain your reasoning.
Based on the points, does there appear to
be a relationship between the amount of
fat and number of calories?
VOCABULARY
bivariate data- data that involves two variables
cluster- data that is grouped together
correlation- describes the type of relationship
between two data sets
2017­4­17 scatter plots day 1.notebook
April 17, 2017
VOCABULARY
positive association- a correlation in which as the values
of one variable increase,
the values of the second variable
also increase
negative association- a correlation in which as the values
of one variable increase,
the values of the other variable
decrease
VOCABULARY
linear association- the points in a scatter plot lie
close to a line
nonlinear association- points lie in the shape of a
curve or form no pattern
outlier- a value that is widely separated
from the rest of the data in a data set
trends- patterns in the same set of data
2017­4­17 scatter plots day 1.notebook
April 17, 2017
2017­4­17 scatter plots day 1.notebook
April 17, 2017
Describe the relationship between the data. Identify any outliers, gaps, or clusters.
a. television size and price Examples:
b. age and number of pets owned
Do the following describe negative,
positive, or no correlation?
1)
3)
2)
4)
2017­4­17 scatter plots day 1.notebook
April 17, 2017
5) The distance someone runs and the
number of calories they burn.
6) A person's height and their number of siblings.
7) The temperature and the amount of snow outside.
8) The time of day a rooster crows and the amount of rain.
9) The height of a tree and the tree's diameter.
Match the data sets with the most appropriate scatter plot. Explain your reasoning.
a. month of birth and birth weight for infants at a day care
b. quiz score and test score of each student in a class
c. age and value of laptop computers