A researcher is interested in determining whether men's and women's attitudes on the environment differ.To do so 100 men and 100 women were randomly sampled and asked: "Do you think the environment is a major concern currently?"Of those sampled, 67 women and 53 men responded that they believed it is.Suppose a 93% confidence interval for the study was (0.016, 0.264).You may assume sample 1 corresponds to women and sample 2 corresponds to men.You may also assume that all assumptions and checks have been verified.

Choose from the following concerning the z-value or t-value that would be used in the interval.

a) t = 1.65

b) z = 1.81

c) t = 2.33

d) z = 1.96