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To start with part (a), check if the data follows an approximately Normal distribution by using a normality test such as the Shapiro-Wilk test or the Kolmogorov-Smirnov test and compare the significance value to alpha = 0.05

Blake Shelton: I mean, I guess so

This decrease coincided with a slight increase in the number of taxed cigarettes sold in the state relative to other states, and it is reasonable to assume that the rate decrease led to a small decrease in illegal cigarette purchases

Just by breathing secondhand smoke at home or work, nonsmokers become 20-30% more likely to develop heart disease or suffer a stroke, and damage can occur in as little as 30 minutes of exposure