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During The Recession That Began In 2008, Not Only Did Some People Stop Making
House Payments, But They Also Stopped Making Payments For Local Government
Services Such As Trash Collection And Water And Sewer Services. The Following Data
Have Been Collected By An Accountant Who Is Performing An Audit Of Account
Balances For A Major City Billing Department. The Population From Which The Data
Were Collected Represents Those Accounts For Which The Customer Had Indicated The
Balance Was Incorrect. The Dependent Variable, Y, Is The Actual Account Balance As
Verified By The Accountant. The Independent Variable, X, Is The Computer-generated
Account Balance.
Mutual Fund AG G G-I IF I AA PM B
C1 6 7 5 1 14 -3 5 -1
C2 7 -2 6 0 13 7 7 3
C3 12 0 2 6 10 7 5 2
X 233 10 24 56 78 102 90 200 344 120 18
Y 245 12 22 56 90 103 85 190 320 120 23
A. Compute The Least Squares Regression Equation. (2 Marks)
B. If The Computer-generated Account Balance Was 100, What Would You Expect
To Be The Actual Account Balance As Verified By The Accountant? (2 Marks)
C. The Computer-generated Balance For Timothy Jones Is Listed As 100 In The
Computer-generated Account Record. Calculate A 90% Interval Estimate For
Mr. Jones’s Actual Account Balance. (3 Marks)
D. Calculate Also A 90% Interval Estimate For The Average Of All Customers’
Actual Account Balances In Which A Computer-generated Account Balance Is
The Same As That Of Mr. Jones (part C). Interpret Your Results. (3 Marks) - Math Discussion

During the recession that began in 2008, not only did some people stop making
house payments, but they also stopped making payments for local government
services such as trash collection and water and sewer services. The following data
have been collected by an accountant who is performing an audit of account
balances for a major city billing department. The population from which the data
were collected represents those accounts for which the customer had indicated the
balance was incorrect. The dependent variable, y, is the actual account balance as
verified by the accountant. The independent variable, x, is the computer-generated
account balance.
Mutual Fund AG G G-I IF I AA PM B
C1 6 7 5 1 14 -3 5 -1
C2 7 -2 6 0 13 7 7 3
C3 12 0 2 6 10 7 5 2
x 233 10 24 56 78 102 90 200 344 120 18
y 245 12 22 56 90 103 85 190 320 120 23
a. Compute the least squares regression equation. (2 marks)
b. If the computer-generated account balance was 100, what would you expect
to be the actual account balance as verified by the accountant? (2 marks)
c. The computer-generated balance for Timothy Jones is listed as 100 in the
computer-generated account record. Calculate a 90% interval estimate for
Mr. Jones’s actual account balance. (3 marks)
d. Calculate also a 90% interval estimate for the average of all customers’
actual account balances in which a computer-generated account balance is
the same as that of Mr. Jones (part c). Interpret your results. (3 marks)