statistics: please answer

Question

A researcher hypothesizes that people who listen to music via headphones have greater hearing loss and will thus score lower on a hearing test than those in the general population. On a stan-dard hearing test, m 522.5. The researcher gives this same test to a random sample of 12 individu-als who regularly use headphones. Their scores on the test are 16, 14, 20, 12, 25, 22, 23, 19, 17, 17, 21, 20.a.Is this a one- or two-tailed test?b.What are H0 and Ha for this study?c.Compute tobt.d.What is tcv?e.Should H0 be rejected? What should the re-searcher conclude?

Answer 1

It's a bit hard to understand parts of your question, but I will do what I can to help.

This is a one-tailed test because the researcher hypothesizes (wants to test) that the earphone population will have a lower mean score.

Let Ma = Mean on the test

Mb = Mean for the 12 individuals

H0 (null hypothesis): Ma = Mb

H1 (alternative): Ma > Mb

The rest I can't answer because I'm not sure what m 522.5, tobt.d, or tcv are?