Provided below are summary statistics for independent simple random samples from two populations. Use the pooled t-test and the pooled t-interval procedure to conduct the required hypothesis test and obtain the specified confidence interval. X, = 20, s1 = 5, n1 = 20, X2 = 21, $2 = 4, n2 = 16 a. Left-tailed test, a = 0.05 b. 90% confidence interval a. What are the correct hypotheses for a left-tailed test? OB. HO: My H2 Ha: M1 = H2 Ha: M1 = H2 OD. HO: My = H2 O C. HO: M1 = H2 Ha: My * H2 Ha: H1 H2 Ha: H1 = H2 Compute the test statistic. t=(Round to three decimal places as needed.) Determine the P-value. P =(Round to four decimal places as needed.) Since the P-value is than a, b. The 90% confidence interval is from to]. (Round to three decimal places as needed.)