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The following data represent the number of Pen drives sold per day at a local
computer shop and their daily average sales prices after bargain. (10 marks)
Price of each pen drive (x)     Units Sold (y)
INR 340                                        3

       360                                        4
       320                                        6
       350                                        5
       300                                        9
       380                                        2
       400                                        1

 

Develop a least-squares regression line and explain what the slope of the line
indicates.

 

Compute the coefficient of determination and comment on the
strength of relationship between x and y.

akhilmaharshi7  May 29, 2017
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1+0 Answers

 #1
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+1

 

The least squares line is :

 

y  =  -0.0736x+29.9734

 

The slope indicates (generally) that as the price increases, the number of units sold decreases

 

The correlation coefficient, r,  is  :  -0.927709243408

 

The coefficient of determination  = r^2  ≈ .86.....I believe this means that the dependent variable can be strongly predicted from the independent variable

 

A method for calculating the regression line can be fond here :

 

https://www.easycalculation.com/analytical/learn-least-square-regression.php

 

 

 

cool cool cool

CPhill  May 29, 2017

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