In studying reward and learning, Sally Statistician believes that verbal reinforcement (encouragement) improves the learning of the alphabet in toddlers. She takes twenty toddlers and randomly assigns them to one of two groups: a "no reward" group (n=10), or a "reward" group (n=10) that receives standardized words of encouragement (e.g., "Good job!") during alphabet learning games. The dependent measure in Sally's study is the number of letters the children pronounce correctly during the testing phase at the end of the study. The reward group correctly pronounces an average of 11.7 words, with a Sum of squares of 134. The no reward group correctly pronounces an average of 7.1 words, with a Sum of squares of 130. Conduct the appropriate t-test at a .05 level of significance, and make a decision regarding the null hypothesis. Show all work, and state your conclusion. Include Cohen's d.