A sample of10 students took a class designed to improve their SAT math scores. Following are their scores before and after the class. Can you conclude that the mean increase in scores differs from 15 points? Let 1 represent the mean score after the class and d=1- 2. Use the = 0.05 level and the P-value method with the table.

ScoreBefore:

440

334

378

467

470

473

408

433

478

502

After:

466

368

396

488

489

474

407

434

490

508

Compute the test statistic. Round the answer to at least three decimal places.