In a recent year, we know that the standard deviation of all ACT scores is 4.8 You take a random survey of 20 students and their ACT scores are: {26,22,23,12,19,25,23,21,25,10,17,26,23,24,20,14,21,23,20,22} If you know the test scores are normally distributed. What is the confidence interval at 95%?