The table summarises the available weights in OCR Large Data Set 9.
GroupNumberMean weight (kg)Sample standard deviation (kg)Male9582.6919.98Female10172.5019.95\begin{array}{c|ccc}\text{Group}&\text{Number}&\text{Mean weight (kg)}&\text{Sample standard deviation (kg)}\\\hline\text{Male}&95&82.69&19.98\\\text{Female}&101&72.50&19.95\end{array}GroupMaleFemaleNumber95101Mean weight (kg)82.6972.50Sample standard deviation (kg)19.9819.95
Make two comparisons between the distributions of male and female weights.
121 exam-style questions on OCR (MEI) A Level Maths 2.2 Data Presentation and Interpretation, covering 2.2.1 Types of data and standard diagrams, 2.2.2 Area in a histogram is proportional to frequency, 2.2.3 Cumulative frequency diagram, 2.2.4 Describe frequency distributions, 2.2.5 Samples and theoretical distributions, 2.2.6 Interpret a scatter diagram, 2.2.7 Distinct sections and outliers in scatter diagrams, 2.2.8 Correlation and causation, 2.2.9 Select or critique data presentation techniques, 2.2.10 Measures of central tendency, 2.2.11 Simple measures of spread, 2.2.12 Variance and standard deviation, 2.2.13 Outliers, 2.2.14 Cleaning data, and 2.2 Data Presentation and Interpretation. Each one has a worked solution and a mark scheme showing where the marks go.