In a study of SAT scores, a researcher believes that students will score significantly higher on their second attempt at the exam. To test this claim, 9 students were randomly selected. Their scores on the first and second attempts at the SAT exam are shown below: Student | A B C D E F G H I First SAT score | 480 510 530 540 550 560 600 620 660 Second SAT score | 490 520 550 530 580 580 610 640 690 What is the test statistic for this test

Anew obstacle course is home to several new types of challenging obstacles. one such obstacle is traversing a 15-stair staircase. to make it more challenging, the stairs are not uniformly spaced. rather, the vertical space between consecutive stairs for the first 10 stairs is 113 feet and the vertical space for the last 5 stairs is 134 feet. what is the total vertical distance traveled ascending and descending the entire 15-stair staircase?