Scenario: You are interested in whether chewing nicotine gum reduces smoking in a particular population. You know that on average the number of cigarettes smoked daily in this population is 13 with a standard deviation of 3. You sample 20 people from this population and have them chew nicotine gum for two weeks and track the number of cigarettes smoked. You find your sample averages 11 cigarettes with a standard deviation of 4.5.

a.What kind of statistical test is appropriate for this scenario?

b. What is the null hypothesis?

c. What is the alternative hypothesis?

d.What is the critical value for this test?

e.What is the value of the obtained statistic? (Show your work)

f.What is your decision for this analysis? (Circle one) Reject or Fail to reject

g.Based on these findings; can you conclude that the machine has become faulty?

(Circle one): Yesor No

h. Compute the effect size of Cohen's d. Be sure to show your work: