IP Maths Notes (Lower Sec, Year 1-2): 09) Data Handling & Statistics

Q: What does IP Maths Notes (Lower Sec, Year 1-2): 09) Data Handling & Statistics cover?
A: Construct tables, compute mean/median/mode, interpret box-and-whisker plots, and justify graph choices for IP assignments.

Statistics converts raw data into decisions. Learn how to summarise, display, and interpret data sets with precision.

Learning targets

• Build frequency tables, cumulative frequency tables, and histograms.
• Compute mean, median, mode, and range (including grouped data estimates).
• Draw and interpret box plots and scatter plots.
• Write commentary sentences that connect statistics to context.

1. Organising data

1.1 Frequency tables

Example: Scores out of 10 - 5, 7, 8, 5, 6, 9, 7.

1.2 Cumulative frequency

Add frequencies progressively to track the number of observations below a threshold. Useful for median estimates in grouped data.

2. Measures of central tendency

• Mean: $\bar{x} = \frac{\sum x}{n}$