Assume a normal distribution with (x^-)_d = 3.55, s_d = 5.97, and n = 15, (Use a table or technology.) Find the critical value for a 90% confidence level. (Round your answer to two decimal places.) (a) Find the critical value for a 90% confidence level. (Round your answer to two decimal places.) (b) using a 90% confidence level, find the point estimate. (c) using a 90% confidence level, find the margin of error. (Round your answer to two decimal places.) (d) what is the 90% confidence interval for this set of paired data? (Round your answers to two decimal places.)
