What is the positive critical value?

A researcher is interested in whether there is a difference in the social level between people who work from home and people who work in the office. The researcher recruited 40 individuals who work from home and 40 individuals who work in the office for a total of 80 participants. Every individual was given a test to determine their social level. For the individuals who work from home, the average social level test score was M equal to 28 and $2 = 14. For the individuals who work in the office, the average social level test score was M equal to 26 and $2 - 21. Use a significance level of 5% to determine whether there is enough evidence to conclude that social level between people who work from home is significantly different than those that work in the office. Please assume that the work from home group is Group 1 and the work in office group is Group 2. What is the positive critical value? O 1.664 1.671 O 1.990 O 2.000