A researcher would like to determine whether a cold medicine has an effect on mental alertness. A sample of n=16 participants is obtained, and each person is given a standard dose of the medication one hour before being tested in a driving simulation task. For the general population scores on the simulation, task are normally distributed with =60 and =8. The individuals in the sample had an average score of M=56.5 .

a) What is the null hypothesis?

b) What is the alternative hypothesis?

c) One-tailed or two tailed test?____________

d) Alpha level?__________

e) What is the z-critical value?_________

f) What is z-obtained?___________

g) What can you conclude about the results of this study?