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a0 ocw @ =0 19. (2 points) The z* value for a 90% confidence interval is 1.645. Which of the options below is most likely the z* value for an 85% confidence interval? 1.645 1.960 2.330 1.440 20. (2 points) If we were going to approximate the following randomization distribution with a normal curve, what normal curve would we use? 350 300 250 200 Lett Tail Two Tail Right Tail samples = 2000 rean = 0.502 std. ervor = 0.099 0.15 0.20 0.25 21. (2points) what are the values of the two parameters for a standard normal distribution?