MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

Solve all part please do not give solution in image format thanku

 

a. The R2 of a multiple regression of y on x1 and x2 measures the ________.

  • percentage of the variation in y that is explained by the variability of x2

  • percentage of the variation in y that is explained by the variability of x1

  • statistical significance of the coefficients in the sample regression equation

  • percentage of the variation in y that is explained by the sample regression equation

 

b. The sample correlation coefficient cannot equal zero.

True or False?

 

c. Costco sells paperback books in their retail stores and wants to examine the relationship between the prices and sales. The price of a particular novel was adjusted each week and the weekly sales are in the following table. Management would like to use a simple linear regression model that uses prices to predict sales.

  

Sales Price
7 $ 12  
4 $ 11  
5 $ 10  
9 $ 9  
8 $ 8  
8 $ 7  
7 $ 7  
 

  

The regression sum of squares for this sample is equal to ________.

  • 6.25

  • 4.17

  • 5.16

  • 4.61

 

d. The coefficients of each explanatory variable in a multiple linear regression model have the same interpretation as the coefficient of the explanatory variable in a simple linear regression model.

True or False?

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Step 2: Choose correct option for part a)
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Step 3: Determine the sentence in part (b) is true or flase.
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Step 4: Determine the regression sum of squares.
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Step 5: Determine the sentence in part (d) is true or false.
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