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


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

akhilmaharshi7  May 29, 2017

1+0 Answers



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 :






cool cool cool

CPhill  May 29, 2017

7 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details