What are the critical values equal to?

Please use the following information to answer the question. A researcher decided to evaluate the effectiveness of having asynchronous materials for their course. A random sample of 64 students had the asynchronous materials course. The general population's exam score forms a normal distribution with mu equal to 80 and sigma equal to 15. The average score for the sample is M equal to 82. Does the sample provide enough evidence to conclude that the asynchronous course's average exam score is significantly different from the general population at the 5% significance level? What are the critical values equal to? 1.64 and -1.64 1.96 and -1.96 O 1.96 and -1.64 O -1.96 and 1.64