what should I USE IN THIS PROBLEM?? ANSWER ONLY ON WHAT SHOULD I USE PLEASE. IS IT SAMPLE VARIANCE OR POPULATION VARIANCE??? NO NEED TO ANSWER THE PROBLEM

6. The following data gives prices for the same basket of goods at different shops. Find the variance and standard deviation of each store. Store X Store Y Store Z Orange Juice 8 10 15 Coke 10 23 18 Milk 25 16 17 Yogurt 13 11 Liquor 55 60 58