Suppose you conduct a randomized trial of smoking cessation with two treatment groups (nicotine patch and placebo). Set up the null hypothesis in order to test the difference in proportions of the two groups with a 5% level of significance.

a. H₀: p₁=?₂(population proportion group 1 is equal to population proportion group 2)

b.

Ho: P1= p2 (sample proportion group 1 is equal to sample proportion group 2)