lu Hypermarket has a record showing data on sales pe vertisement (in hundreds of rials) for the last five yeam lowing details. EX = 132 EX? = 3,502

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter7: Distance And Approximation
Section7.3: Least Squares Approximation
Problem 32EQ
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ew Romai v 12
- A A Aav A EEE E E
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e Replace
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Question 4:
Lulu Hypermarket has a record showing data on sales per year (in thousands of rials) and
advertisement (in hundreds of rials) for the last five years. The record gives the
following details.
ΣΧ-132
EX? = 3,502
EY = 96
EY? = 1,870
EXY = 2,553
a. Please develop the least squares estimated regression line.
b. Using your regression line developed in Part a, predict the sales when
advertisement is $3,000.
c. At a = 0.05, determine if advertisement and sales are related (perform a t test).
d. Develop a 95% confidence interval for estimating the mean sale for those
years when advertisement was $3,000.
e. Compute the coefficient of determination.
Answers:
D. Focus
ds
English (United States)
e here to search
Transcribed Image Text:ew Romai v 12 - A A Aav A EEE E E Find AaBbC AaBbCcDc AaBbCcDc AaBbC e Replace U v ab x, x A .A. Heading 3 1 Normal 1 No Spac. Heading 1 A Select Font Paragraph Styles Editing Question 4: Lulu Hypermarket has a record showing data on sales per year (in thousands of rials) and advertisement (in hundreds of rials) for the last five years. The record gives the following details. ΣΧ-132 EX? = 3,502 EY = 96 EY? = 1,870 EXY = 2,553 a. Please develop the least squares estimated regression line. b. Using your regression line developed in Part a, predict the sales when advertisement is $3,000. c. At a = 0.05, determine if advertisement and sales are related (perform a t test). d. Develop a 95% confidence interval for estimating the mean sale for those years when advertisement was $3,000. e. Compute the coefficient of determination. Answers: D. Focus ds English (United States) e here to search
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