A. What is the sample mean ?B. What is the standard deviation? C. What is the 95% confidence interval (to 2 decimal places)

United Flights in December We look at a random sample of 1000 United flights in the month of December comparing the actual arrival time to the scheduled arrival time. Computer output of the descriptive statistics for the difference in actual and expected arrival time of these 1000 flights are shown below. N Mean StDev SE Mean Min Q1 Median Q3 Max 1000 -9.53 41.4 1.31 -12 0 18 470 X\\\\ Your answer is incorrect. (a) What is the sample mean difference in actual and expected arrival times? What is the standard deviation of the differences