Question

A national organization ran an advertising campaign designed to convince people to quit smoking. To evaluate their campaign, they had subjects record the average number of cigarettes smoked per day in the week before and one week after exposure to the ad. What can be concluded with α = 0.05. The data are below.

before	after
35 17 12 29 18 19 27 26 16 41	46 17 21 34 31 20 34 26 27 41

a) What is the appropriate test statistic?
---Select--- na z-test One-Sample t-test Independent-Samples t-test Related-Samples t-test

b)
Condition 1:
---Select--- before smoking after advertising campaign cigarettes
Condition 2:
---Select--- before smoking after advertising campaign cigarettes

c) Obtain/compute the appropriate values to make a decision about H₀.
(Hint: Make sure to write down the null and alternative hypotheses to help solve the problem.)
critical value =  ; test statistic =  
Decision:  ---Select--- Reject H0 Fail to reject H0

d) If appropriate, compute the CI. If not appropriate, input "na" for both spaces below.
[  ,  ]

e) Compute the corresponding effect size(s) and indicate magnitude(s).
If not appropriate, input and/or select "na" below.
d =  ;   ---Select--- na trivial effect small effect medium effect large effect
r² =  ;   ---Select--- na trivial effect small effect medium effect large effect

f) Make an interpretation based on the results.

There was a significant decrease in cigarettes smoked after the ad.

There was a significant increase in cigarettes smoked after the ad.     

There was no significant difference between the number of cigarettes smoked before and after the ad.

Answer 1