Sewanhaka High School
Mrs. Lidowsky, Principal
Math 8
Mr. Long, Teacher
Per:______________
Date:________________________
Name:___________________________________
H.W. #67: Ditto
DO-NOW #67: Answer the following questions:
1) Solve the following system of
CHECK:
equations
algebraically and check:
3x - 2y = 22
2x + 5y = 2
2)
Topic: Statistics
Main Idea: Scatter Plot
Aim:
RECALL
NOTES
Elissa had to do a research project on average SAT math
scores of students at SHS over a ten year period, 1998 to
2007. She put the information she found into the
following table:
YEAR
1998 1999 2000 2001 2002
SCOR 503 504 506 508 511
E
YEAR
2003 2004 2005 2006 2007
SCOR 512 511 514 514 516
E
Develop the information from the table into a scatter plot.
Does the data displayed on the graph resemble a line rising from left
to right, a line falling from left to right, or neither (does not appear to
rise or fall)?
Do the points in the scatter plot seem to form a line or a curve?
What is the name for the two variable data, the years on the x-axis and
the scores on the y-axis?
Do you recognize any clusters within the scatter plot?
Make a scatter plot based on the following table:
Age (in years)
0
0
1
2
2
3
18 23 20 17 21 13
Car Value
($)
(in
thousands)
Age (in years)
3
4
4
5
5
6
17 14 17 10 13 7
Car Value
($)
(in
thousands)
Age (in years)
6
7
7
8
8
9
10 8 11 4 7 4
Car Value
($)
(in
thousands)
Does the data displayed on the graph resemble a line rising from left
to right, a line falling from left to right, or neither (does not appear to
rise or fall)?
Does the data represent linear or nonlinear association? Why?
A line more so than a curve is formed.
Do you see clustering amongst the scatter plot?
What if I added another car, a 6 year old car at $27,000. Plot that
point on the scatter plot. What can I say about that point as compared
to the entire scatter plot?
Make a scatter plot based on the following table:
Birth Month
Jan. Feb. Mar. Apr. May June July
Birth
Weight
(in lbs.)
6
5.5
7.5
7
10
6.5
8
5
7.5
7
Aug
7.2
5.3
8
6
Sept Oct.
.
7
4.5
6.5
Nov
.
7.7
Dec
.
5.5
9
7.5
Does the data displayed on the graph resemble a line
rising from left to right, a line falling from left to right,
or neither (does not appear to rise or fall)?
Can we form a curve or a line from the scatter plot?
Drill:
Make a scatter plot for each of the following tables. Determine whether the scatter plot of the data for the following might show a positive,
negative, or no association at all. Also look for linear or nonlinear association. Is there any clusters or outliers?
1) The table shows the average cost of a loaf of bread
from 1920 to 2000.
YEAR
1920 1930 1940 1950 1960
9
8
14
20
CENTS 12
YEAR
1970 1980 1990 2000
52
72
99
CENTS 24
2) The table shows the study time of students as
compared to their test scores.
10 15 23 30 42 55 60 60
Study Time
(min.)
65 67 96 76 74 78 82 91
Test
Scores
70 75 90 96 110 120
Study Time
(min.)
73 87 95 94 75 97
Test
Scores
ANSWER:
ANSWER:
Summary: