I need to solve the T -statistic for the test below is the table the

I need to solve the T  -statistic for the test below is the table the Answer is  t= - 7.646  But i need to understand how they obtain this answer in order to do a similar question. Weight (Carat) Price ($) 0.22 616 0.25 712 0.27 750 0.28 843 0.27 724 0.19 501 0.17 349 0.23 650 0.22 608 0.24 634 0.29 863 0.16 347 0.17 377 0.16 295 0.18 462 0.24 609 0.22 581 0.16 389 0.17 402 0.28 752 0.25 694 0.23 651 0.26 737 0.19 432 0.22 560 0.27 736 0.28 846 0.25 660 0.24 647 0.21 504