Mr. Ali runs a gift shop in the Defense area, Karachi. He advertises weekly in the local newspapers and is considering increasing his advertising budget. Before doing so, he decides to evaluate the past effectiveness of these advertisements. Five weeks are sampled, and the advertising expenses (in PKR) and sales volume for each is shown in the table given below:

Sales (PKR 100k)

6

8

6

10

6

Advertising (PKR 100k)

4.1

6.72

5.05

7.26

2.69

1. Calculate coefficient of determination and in the light of the value of coefficient of determination which statement is true. (write only number of correct option in answer box)
2. Less than 73.3 % variation in sales due to advertising
3. Less than 73.3 % variation in advertising due to sales
4. More than 73.3 % variation in sales due to advertising
5. More than 73.3 % variation in advertising due to sales
6. 73.3 % variation in advertising due to sales
7. 73.3% variation in sale for advertising