1. a) ____________ is a good measure to show the spread of the data. (3 points) b) If a confidence interval for a population mean is [2, 5] at = 10%, it means we are _______ percent confident that the true mean lies in [2, 5].

2.On a Saturday evening your father and mother take you out for dinner. There are 7 other customers in the restaurant, and their ages are as following: 44, 56, 25, 40, 32, 34, 38. a) Write down the ages for your father, mother and you. (3 points) b) Compute the median for the age of all the customers in the restaurant. (4 points) c) Determine the 25th percentile. (4 points) d) Determine the IQR. (4 points) e) Identify all outliers, if any. (4 points)