A grocery store might want to know if the price of eggs is related to the number of eggs sold. They could do a regression analysis to find out. They would gather data on how many eggs are sold each week at different prices and then use a software program to see if a line can be drawn that best predicts the number of eggs sold based on the price of eggs. If there is a relationship between price and the number of eggs sold, then the grocery store can raise or lower their prices accordingly to sell more or fewer eggs.