Calculate the seasonal index for the following data using simple average method.

Here are the solutions for questions 11, 12, 13, and 14.

Question 11: Calculate the seasonal index for the following data using simple average method.

Step 1: Calculate the average for each quarter.

• 1st Quarter Average: $$\frac{72+76+74+76+78}{5} = \frac{376}{5} = 75.2$$
• 2nd Quarter Average: $$\frac{68+70+66+74+74}{5} = \frac{352}{5} = 70.4$$
• 3rd Quarter Average: $$$$