A physician wants to see if there was a difference in the average smokers' daily cigarette consumption after wearing a nicotine patch. The physician set up a study to track daily smoking consumption. In the study, the patients were given a placebo patch that did not contain nicotine for 4 weeks, then a nicotine patch for the following 4 weeks. Test to see if there was a difference in the average smoker's daily cigarette consumption using = 0.01. The hypotheses are:

H₀ : _D = 0

H1 : _D 0

t-Test: Paired Two Sample for Means
	Placebo	Nicotine
Mean	16.75	10.3125
Variance	64.46667	33.29583
Observations	16	16
Pearson Correlation	0.6105
Hypothesized Mean Difference	0
df	15
t Stat	4.0119
P(T<=t) one-tail	0.0006
t Critical one-tail	2.6025
P(T<=t) two-tail	0.0011
t Critical two-tail	2.9467

What is the correct decision?