Box plot and Histograms Describing Groups 1 Objectives

Box plot and Histograms Describing Groups 1

Objectives 2. 1. 10 construct and use parallel box plots (including the use of the ‘Q 1 – 1. 5 x IQR’ and ‘Q 3 + 1. 5 x IQR’ criteria for identifying possible outliers) to compare groups in terms of location (median), spread (IQR and range) and outliers, and interpret and communicate the differences observed in the context of the data 2. 1. 11 compare groups on a single numerical variable using medians, means, IQRs, ranges or standard deviations, and as appropriate; interpret the differences observed in the context of the data and report the findings in a systematic and concise manner 2

Summarising data – Box plots - Comparing Statistical Description: Median – Location of the median. Does one group have a larger median the other ? 3

Summarising data – Box plots - Comparing Statistical Description: Min/Max – Compare the min and max scores. What could it mean? 4

Summarising data – Box plots - Comparing Statistical Description: Quartiles – What do Q 1, Q 2, Q 3 suggest? 5

Summarising data – Box plots - Comparing Statistical Description: Variation – What does the IQR suggest? 6

Key Words - Summary Shape Description: Skewness – Left Skewed, Symmetrical, Right Skewed 7

Key Words - Summary Shape Description: Skewness – Left Skewed, Symmetrical, Right Skewed 8

Summarising data – Box plots - Comparing Shape Description: Skewness – Left Skewed, Symmetrical, Right Skewed 9

Key Words - Summary Context Description: Implications – what do all the previous things say about the set of data that is being analysed? 10

Ex 4 B 11