7. Tim Hortons was interested in evaluating the sales effect of two different colours (the test variable) for the package of one of its coffee bean products. The firm selected 10 stores with similar monthly sales of coffee beans and randomly split them into two groups of five stores each. One group of stores was stocked only with brown packages, while the other group of stores was stocked only with blue packages. All the stores were monitored for two weeks to make certain that the packages were properly displayed and that no stock-outs occurred. Table below shows the number of packages sold in each store for the two-week period. Help Tim Hortons to decide the right package color. [10 marks]

Sales by Store
Brown Package			Blue Package
Store A	12		Store V	8
Store B	8		Store W	18
Store C	10		Store X	20
Store D	12		Store Y	22
Store E	14		Store Z	24