A study for treatment of insomnia had a sample of 20 patients who received cognitive behavioral therapy. Their additional sleep (minutes) after treatment were:

-11, 21, 14, -9, 4, -3, 0, 17, 40, -5, -4, 3, 13, 9, 14, 6, 11, 5, 0, -13

If we conduct a Significance Test for whether the treatment is effective (that is, does it produce a positive average sleep change), what would our Null and Alternative hypotheses be? Conduct a Significance Test at the 5% level to see if the results of the therapy are Statistically Significant.