A researcher is interested in personality differences between cat and dog owners. She selects a sample of 10 participants who have dogs and 8 participants who have cats and has them complete a measure of introversion. She finds that dog owners have a mean introversion score of 60 and cat owners have a mean introversion score of 65, and their pooled variance is 25. (two tailed test, alpha = .05) Calculate the test statistic (t)