TI- 84 Graphing Calculator
Let the “little people” do
the work!
Why Use A Calculator?
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Cheaper than a laptop
Students learn visually and hands-on
Students are engaged
Students are critical thinkers
Students are problem solvers
Students are 21st Century learners
Why teachers use a graphing calculator?
Student Objectives
Create a scatter
plot of
a
data set
Explore the linear
model of a data set
Slope
Y-intercept
Find the mean
(average)
value for a data
set
Data Collection – “More Students Apply Early”
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Press Stat, Edit, Enter – Data in Lists (already completed )
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Press Stat, Enter and highlight L3
(press up arrow ^ to highlight)
• Press 2nd [List] > 7, 2nd [L2] ), Enter
Press 2nd, Y= and adjust the settings for the
scatter plot.
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Press Window and set the
appropriate values for the data
Press
Graph
Focus Questions
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What is the average increase in the number
of students that are applying early for the
time period shown in our data?
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What is the linear function modeling this
data?
Focus Questions Continued
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What does the slope and y-intercept mean in
the early decision-year scenario?
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Predict the total number of students applying
for early decision for the period 2004 through
2007.
Focus Answers
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Your scattered plot should show that 6197 students are
applying for early decision
Y=5908.7857142857X +42998.357142857
slope = 5909 (increase of students/time period
y-intercept = 42998 (number of students that applied early in 1997-
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98)
Back to Questions Page
Answers Continued
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The values shown below are found using the
linear model. (refer to Slide #6)
Year
#of
students
2004-05
2005-06
2006-07
Total
84,360 90,269 96,177 270,805