Calculate the test statistic and p-value for a test of equal population proportions. What is your conclusion?
a. Left-tailed test, α = .10, x1 = 28, n1 = 336, x2 = 14, n2 = 112
b. Right-tailed test, α = .05, x1 = 276, n1 = 300, x2 = 440, n2 = 500
c. Two-tailed test, α = .10, x1 = 35, n1 = 50, x2 = 42, n2 = 75