When examining group difference where no direction of the difference is specified,which of the following is used?

A) two-tailed test
B) one-tailed test
C) directional hypothesis
D) critical value

A two-tailed test is used when examining group differences where no direction of the difference is specified. This is because a two-tailed test considers the possibility of differences in both directions (i.e., higher or lower) and allows for a more comprehensive examination of group differences. One-tailed tests are used when a specific direction of the difference is hypothesized, and directional hypotheses are used to specify the direction of the expected difference. Critical values are used in hypothesis testing to determine whether the obtained results are statistically significant.