Can someone help me ?

What situation is an example of an observational study

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer

2. using calculations based on a perpetual inventory system, determine the inventory balance altira would report in its august 31, 2021, balance sheet and the cost of goods sold it would report in its august 2021 income statement using the average cost method. (round "average cost per unit" to 2 decimal places.)