. Jerry Sam owns and operates a chain of 12 department stores in New Ville. Sales figures and advertising expenses for the stores are provided in the table below. Sales are given in millions of dollars; advertising expenses are in tens of thousands of dollars. Store Advertising Sales 1 14 6 2 11 3 3 15 5 4 16 5 5 24 15 6 28 18 7 22 17 8 21 12 9 26 15 10 43 20 11 34 14 12 9 5 i. Calculate the slope for the regression line and show all working. ii. Calculate the intercept for the regression line and show all working. iii. Write the equation for the regression line iv. Forecast sales for a store if advertising spending is:- 1. $240,000 2. $300,000
a. Jerry Sam owns and operates a chain of 12 department stores in New Ville. Sales figures
and advertising expenses for the stores are provided in the table below. Sales are given in
millions of dollars; advertising expenses are in tens of thousands of dollars.
Store Advertising Sales
1 14 6
2 11 3
3 15 5
4 16 5
5 24 15
6 28 18
7 22 17
8 21 12
9 26 15
10 43 20
11 34 14
12 9 5
i. Calculate the slope for the regression line and show all working.
ii. Calculate the intercept for the regression line and show all working.
iii. Write the equation for the regression line
iv. Forecast sales for a store if advertising spending is:-
1. $240,000
2. $300,000
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