# Correlation copy by HC12022817429

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```									Scatter Plots and
Correlations
Is there a relationship
between the amount of
gas put in a car and the
number of miles that can
be driven?
Positive Correlation
As one set of data values increases, so
does the other.
Positive Correlation
20

18

16

14

12

10

8

6

4

2

0
0   2   4   6   8   10   12
Is there a relationship between
the number of things you buy
at the mall and the amount of
money you have left?
Negative Correlation
As one set of data values increases, the
other decreases.
Negative Correlation
25

20

15

10

5

0
0   2   4   6   8   10
Is there a relationship between a
person’s age and the temperature
outside?
No Correlation
There is no relationship between the
two sets of data.
No Correlation
25

20

15

10

5

0
0      5     10      15
Would a scatter plot show a
positive,negative, or no
correlation?
Number of pages printed by a printer
and the amount of ink left in the
cartridge.
– Negative Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?

Age of a child and the child’s shoe size
– Positive Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?
Number of letters in a person’s first
name and the person’s height.
– No Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?

Shots attempted and the number of
– Positive Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?
Length of a taxi ride and the amount of
the fare
– Positive Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?
Outside temperature and the cost of air
conditioning.
– Positive Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?
Miles ridden on a bicycle and the
– Negative Correlation!
Would a scatter plot show a
positive,negative, or no
correlation?
Temperature outside and the amount of
clothing a person wears
– Negative Correlation!
Think of some situations that
show a….
Positive Correlation:

Negative Correlation:

No Correlation:
Which graph to use…..?
Use bar graphs to make comparisons.
Use line graphs to show change over time.
Use circle graphs to show percentage of a
whole.
Use histograms when the data is arranged in
intervals.
Use scatter plots to show correlations
between two sets of numerical data.
Using the appropriate measure
of central tendency
In a company there are 10 employees
who each make \$10,000 per year. The
boss makes \$80,000 per year. A job
recruiter tells applicants that the
average salary at the company is
\$16,364.

Which measure of central tendency did
the job recruiter use?

Which measure of central tendency
should he have used?
What measure of central tendency
to use?
Use the mean when the data values are
close together.
Use the median when there are large
gaps in the data values.
Use the mode when looking for the
most common outcome.

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