When tossing a particular coin, 0 is the probability of getting "heads". You created a hypothesis test for the fairness of this coin: Ho: 0 = 0.5 and H1: 0 = 0.5. You flipped the coin 100 times and observed 64 heads. Using the normal approximation for the distribution of the maximum likelihood estimator of 0, calculate the critical point (z) for this test. Give your answer correctly to 3 decimal places