4. An inspector wants to test if the Coke-litro-filling machine is defective by getting a random sample of 22 Coke litro from different batches filled by the machine. It is found out that the sample mean of the random sample is about 1.09 liters with a sample standard deviation of 0.15 liters. Which among the values is the critical regions applicable for the test? Use 0.01 level of significance.  a. t > -2.831 and t < 2.831  b. t < -1.96 and t > 1.96  c. t < - 2.831 and t > 2.831  d. t > -1.96 and t < 1.96

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