Given p1 = 0.85, n1 = 400, p2 = 0.90, n2 = 350. (You may find it useful to reference the appropriate table: z table or t table) a. Construct the 90% confidence interval for the difference between the population proportions. (Negative value should be indicated by a minus sign. Round final answers to 2 decimal places.) b. Is there a difference between the population proportions at the 10% significance level? multiple choice Yes, since the confidence interval includes the value 0. No, since the confidence interval includes the value 0. Yes, since the confidence interval does not include the value