A manufacturer of furniture claims that the company's new model of bookshelves is easier to assemble than the old model. To test the claim, 7 people were assigned to assemble the bookshelves from each of the two models. Here are the times (in minutes) they needed to assemble the bookshelves. Persons 1 2 3 4 5 6 7

Old Model 17 22 20 14 15 21 24

New Model 15 19 18 13 15 19 23

Test if the mean assembly time for the new model is shorter than that of the old model using = 0.05 & 0.01.