A researcher is interested in doing a study comparing the effectiveness of two different approaches to teaching place value in mathematics. One approach uses manipulatives that represent the base-10 system and the other teaches in a traditional way. She randomly assigns 30 first-grade children to the manipulatives-based approach and 30 children to the other approach. Her dependent variable is the number of problems solved on a place value test. In order to compare the groups, what inferential test should she use? Group of answer choices 2 test for contingency tables partial correlation coefficient t test for independent groups post hoc analysis of variance