The student newspaper at your college recently changed the format of their opini

Question

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, 0 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.

What is Null hypothesis and alternative hypothesis here?

Explanation / Answer

Each score reflects a respondent's view of the difference in quality of the old and new formats.

So, the null hypothesis could be

Null: The population median score is zero.

and this could be tested against the alternative hypothesis

Alternative: The population median score is not equal to zero.

I have framed the hypotheses in terms of the population median here because the data are ordinal.

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