A researcher is interested in the rate of childhood adversity between extremists and non-extremists. To answer this question, she had 300 extremists, and 300 non-extremists complete the Adverse Childhood Experiences (ACE) questionnaire. Scores for the ACE range from 0 to 10, with higher scores indicating more childhood adversity. Based on this questionnaire, extremists had an average ACE score of 4.27, with a standard deviation of 1.25. Non-extremists had an average ACE score of 4.00, with a standard deviation of 1.20. Help this researcher determine whether there is a difference in childhood adversity between these two samples.