State the appropriate null hypothesis Ho and alternative hypothesis Ha in each o

Question

State the appropriate null hypothesis Ho and alternative hypothesis Ha in each of the following cases. (a) A study reported that 80% of students owned a cell phone. You plan to take an SRS of students to see if the percent has increas Ho: ? > 0.8; Ha: ? = 0.8 Ho: ? 0.8 (b) The examinations in a large freshman chemistry class are scaled after grading so that the mean score is 82. The professor thinks that students who attend morning recitation sections will have a higher mean score than the class as a whole. Her students this semester can be considered a sample from the population of all students she might teach, so she compares their mean score with 82. (c) The student newspaper at your college recently changed the format of their opinion page. You take a random sample of students and select those who regularly read the newspaper. They are asked to indicate their opinions on the changes using a five-point scale: -2 if the new format is much worse than the old, -1 if the new format is somewhat worse than the old, O if the new format is the same as the old, +1 if the new format is somewhat better than the old, and +2 if the new format is much better than the old

Explanation / Answer

a option 4 H0:mu=0.8(80% students have cell phone) vs Ha:mu>0.8(more tha 80% students have cell phone)

b.option 2 H0:mu=82(Students attend morning recitation have same score as other students) vs Ha:mu>82(Students attend morning recitation have better scores than other students)

c.option 3 H0:mu>0(new format is better than old one) vs Ha:mu<0 (old format was better than new one)

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