Two professors at a local college developed a new teaching curriculum designed to increase students' grades in math classes. In a typical developmental math course, 55% of the students complete the course with a letter grade of A, B, or C. In the experimental course, of the 19 students enrolled, 13 completed the course with a letter grade of A, B, or C. Is the experimental course effective at the a = 0.025 level of significance? Complete parts (a) through (9). (b) Verify that the normal model may not be used to estimate the P-value. Because npo (1 - Po) = 10, the normal model be used to approximate the P-value. (Round to one decimal place as needed.)