You are conducting a hypothesis test where alternative (research) hypothesis is that mu is greater than 850. You take a sample of size 64. Your sample average is 840, and the standard deviation is 20. Your test will be at the 0.05 significance level. What is/are the critical values for this test?   Group of answer choices 1.96 1.64 -1.64 -1.64 and 1.64

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