Chapter SH, Problem 4.19EP

To determine

To write equation of regression.

Answer to Problem 4.19EP

  $y=722.8+4.3x$

Explanation of Solution

Given information:

  

Formula used:

  

  

The equation of regression y= a + bx,

Where,

y is the dependent variable (that’s the variable that goes on the yaxis)

And x is the independent variable (i.e. it is plotted on the x axis), b is the slope of the line and a is the y-intercept.

n is total number of variables.

Calculation:

Table

  

From table

  

  

  

  

  

n=5

Using formula to calculate, a

  

On solving,

  

Further solving,

  

So,

a= 4.3

Using formula to calculate, b

  

On solving,

  

On solving,

  

On solving,

b= 722.8

Substituting values of a and b in the regression equation to obtain regression equation

  $y=722.8+4.3x$