You are conducting a hypothesis test where the null hypothesis is that mu is less than or equal to 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 -1.64 and 1.64 1.96 -1.64 1.64

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