Exit Ticket

1
Exit Ticket Three data tables are shown below.
Only one of the three can be modeled
with a linear function. Circle the letter of
the one that can be modeled with a linear
function and write the equation for the
function. a. b. c.
y 2x 1
193
2
Answers to even-numbered HW problems
Section 3.3 S-2
Since x-values are evenly spaced
and y-values are not, the data are
not linear. Ex 2a) y 866x
1,712,983 where x years and y tuition
b) Graph c) The formula predicts a
tuition of 21,615 for 2003. Ex 8a) The table of
differences shows that the data are linear
because as the acceleration increases by a
uniform amount (3), so does the force (45)
b) F 15A c) Force increases 15 newtons
for each 1 m/sec2 increase in acceler. d)
F(15) 225
5 4 4
13,821 if x years since 1994
3
The chart below represents the number
of
automobiles (in millions) produced
worldwide in each of
the years listed.
Use the graphing calculator to make a graph of
the data.
4
The chart below represents the number
of
automobiles (in millions) produced
worldwide in each of
the years listed.
5
Are the data approximately linear?

Are the data linear?
What linear function would be a good model for
this data?
A of automobiles produced (in millions) t
number of years since 1970
A .65t 23.3
6
The Regression Line (also called the
least-squares fit line) for a set of data is a
line that is, on average, closest to each data
point.
7

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9
Regression equation y .648x 22.78
Questions Explain in practical terms the meaning
of the slope of the regression line
model.
10
Regression equation y .648x 22.78
Questions What is the models estimate of
automobile production in 1970?
How far from the actual 1970
automobile production is the estimate?
11
Regression equation y .648x 22.78
Questions Use the regression equation to
estimate automobile production in 2005.
12
Global passenger car production
grew in 2005 to 45.6 million
units.
Source Worldwatch Institute http//www.worldwatc
h.org/node/4288
13
Homework Read Section 3.4 (through bottom of
page 237) Page 242 S-1, S-2, S-3, S-5,
S-7 Pages 243 245 1, 2, 5, 9 All graphs
to be done on the calculator
Complete Practice Test, except question 28