You believe that listening to classical music can help brain function. To test this, you select a random sample of students to take a test where the average score is 85 in the population. You have students take the test while listening to music, and you think their average score will be higher than average. Test your hypothesis with alpha level of .05. Write the hypotheses in words and include the population value.

17. Is this a one-tailed or two-tailed t-test?__

18. Null hypothesis: ____

19. Alternative hypothesis: ___

20. Find the Critical value for t (consult t-table, use =.05, 1-tailed, (df =n-1 = __) critical t = ______