20 Statistics and the Casio fx-9750G Plus • Activity 4 Copyright © Casio, Inc.
Introduction
Sandy’s parents loaned her some money for her to use
during college. She noticed that she spent a certain
percentage of that money each month. The chart below
represents the amount of money left in Sandy’s account at
the end of the each month the first twenty months away
from home.
Problems and Questions
1. What regression equation best represents her
spending?
____________________________________________________
2. Explain what the coefficients and other numbers in
your equation mean.
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
____________________________________________________
3. How much money will she have in her account in 4
years, the estimated time she will be away at college?
____________________________________________________
4. Will she have enough money to make it through?
Why or why not?
______________________________________________________________________________
______________________________________________________________________________
5. When will she run out of money according to the regression equation?
Is this realistic? Why or why not?
______________________________________________________________________________
______________________________________________________________________________
Name _____________________________________________ Class ________ Date ________________
Activity 4 • Spending Too Much
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20
Money Left
in Account
$5200.00
$5050.00
$4904.50
$4763.30
$4626.40
$4493.60
$4364.80
$4239.90
$4118.70
$4001.10
$3887.10
$3776.50
$3669.20
$3565.10
$3464.10
$3366.20
$3271.20
$3179.10
$3089.70
$3003.00
Month
Data:
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