The management of a restaurant with locations all over the country has developed a new hamburger that researchers believe will sell better than the hamburger that is currently sold. Which of the following is the best way to perform a randomized experiment with the goal of determining if this new hamburger will sell better than the hamburger that is currently sold? Randomly select 40 regions from all regions throughout the country, have the restaurants in those regions stop selling the current hamburger, and start selling the new hamburger to see if sales increase. Randomly select 40 regions from all regions throughout the country, have the restaurants in those regions stop selling the current hamburger, and start selling the new hamburger to see if sales increase. Have all the company’s restaurants throughout the country stop selling the current hamburger and start selling the new hamburger to see if sales increase. Have all the company’s restaurants throughout the country stop selling the current hamburger and start selling the new hamburger to see if sales increase. Randomly select 40 restaurants, let each one decide if it wants to sell the new hamburger, and compare sales in those restaurants to sales in the restaurants that chose not to sell the new hamburger. Randomly select 40 restaurants, let each one decide if it wants to sell the new hamburger, and compare sales in those restaurants to sales in the restaurants that chose not to sell the new hamburger. Have all the restaurants in the western part of the country stop selling the current hamburger and start selling the new hamburger to see if these restaurants’ sales are higher than the restaurants in the eastern part of the country that continue selling the current hamburger.