Two professors at a local college developed a now teaching curriculum designed to increase students' grades in math classes. in a typical developmental math course, 45% of the students complete the course with a letter grade of a, b, or c. in the experimental course, of the 20 students enrolled, 18 completed the course with a letter grade of a, b, or c. is the experimental course effective at the alpha = 0.05 level of significance? identity the correct null and alternative hypotheses. h_0: p = 0.45 versus h_1: p > 0.45 determine the p-value. p-value = (round to three decimal places as needed.)