STAT 200 Chapter 9 Problem Set Name: 1) One group of 20 normally developing toddlers earned a mean score of 43 for aggression on the CBCL (SD =7). A group of 14 aggressive toddlers earned a mean score of 47 for this measure (SD = 3). Is the difference between these two groups statistically significant? 2) What is the Cohen's d effect size for problem #1? 3) One group of 8 normally developing infants earned a mean score of 10 for mental development on the Bayley Scales of Infant Development (SD = 1/). A group of 6 developmentally delayed infants earned a mean score of 7 for this measure (SD = 12). Is the difference between these two groups statistically significant? 4) What is the Cohen's d effect size for problem #3?5) One group of 32 Statistics students earned a mean score of 91 for an exam score (SD = 10). A group of 17 Statistics students earned a mean score of 84 for this measure (SD = 9 ). Is the difference between these two groups statistically significant? 6) What is the Cohen's d effect size for problem #5? 7) One group of 18 normally developing children earned a mean score of 44 for depression on the CBCL (SD =3). A group of 7 depressed children earned a mean score of 49 for this measure (SD = 6). Is the difference between these two groups statistically significant? 8) What is the Cohen's d effect size for problem #7?9) One group of 15 normally developing toddlers earned a mean score of 73 for social skills on the CBCL (SD = 9). A group of 8 developmentally delayed toddlers earned a mean score of 63 for this measure (SD = 10). Is the difference between these two groups statistically significant? 10) What is the Cohen's d effect size for problem #9