Identify hypotheses, Part I. Write the null and alternative hypotheses in words and then symbols for each of the following situations. (a) A tutoring company would like to understand if most students tend to improve their grades (or not) after they use their services. They sample 200 of the students who used their service in the past year and ask them if their grades have improved from the previous year. Null Hypothesis: Grades have not improved for any students. Grades have not improved for a majority of students. Grades have improved for all students. Grades have improved for a majority of students. Correct Alternative Hypothesis: Grades have not improved for any students. Grades have improved for all students. Grades have not improved for a majority of students. Grades have improved for a majority of students. Correct H0: p < 0.5 p = 1 p > 0 p = 0 p < 1 p > 0.5 p = 0.5