Scenario/Research Question: What is the impact of seat belt use on length of stay in the pediatric ICU following traumatic brain injury? Variables: Independent - seat belt use - ordinal level of measurement, 2 groups Dependent - length of stay in pediatric ICU - interval/ratio level of measurement Population: children with traumatic brain injury in ICU Null Hypothesis: The use of seat belts has no impact on the length of stay in the pediatric ICU. O one-way ANOVA O one-sample t-test O paired samples t-test O independent samples t-test