Section A Short Answer Questions (10 Questions: 2 marks each) 1) If the mean is 15 and the data set is normally distributed what will the median be? (2 marks) 2) If the value for r is greater than 1, what does this mean? (2 marks) 3) If the standard deviation is small what does this indicate about the sample? (2 marks) 4) Why might the mode be useful to a retail business? (2 marks) 5) Interpret this scatter plot shown below (2 marks) Question 5 Scatter Plot 12 10 . 8 a. 0 .,. e E 6 .9 m 4 '6' ------- am ..... 2 - _____ o . .. 0 0 2 4 6 8 10 12 14 16 18 Time 6) What types of graph or chart should be used to display categorical data? (2 marks) 7) What are the advantages of using a stern and leaf diagram to display data? (2 marlG) 8) A doctor wants to research the effectiveness of a vaccine in UK cities what sampling technique should he use? (2 marks) 9) Name the two types of quantitative data? (2 marks) 10) If data is skewed what should you do? (2 marks)