Determine the appropriate critical value(s) for each of the tests in parts a through d below concerning the population proportion. Ii Click the icon to view the standard normal distribution table. a. upper-tailed test: a = 0.05, n = 53 z= 1.645 (Round to three decimal places as needed. Use a comma to separate answers as needed.) b. lower-tailed test: a = 0.025, n = 28 2=D (Round to three decimal places as needed. Use a comma to separate answers as needed.)