Population and sample, the four levels of measurement, building a frequency table, drawing and reading bar charts and pie charts.
5 narrated scenes. Press play, listen and read along — the points appear as they are explained. Use ‹ Prev / Next › or the scene bar to jump to any scene.
Every poll, every weather report, every sales chart starts with the same question: how was the data collected, and how is it shown?
Narration uses your device’s built-in voice. No sound? Switch to “Captions only” — the captions advance on their own.
Copy these into your notebook in your own words — that is how they stick.
Population = whole group; sample = part measured. Statistic (sample) vs parameter (population). Random, representative samples avoid bias.
Nominal (names), ordinal (order), interval (equal gaps, no true zero), ratio (true zero).
Discrete: counted (siblings). Continuous: measured (height, time).
Tally → frequency; check Σf equals the number of items.
Equal widths, gaps, even scale, labelled axes and title.
Angle = f ÷ total × 360°; f = angle ÷ 360 × total; angles sum to 360°.
Find modes (tallest bar / biggest sector), compare categories, spot trends.
Truncated axes, uneven scales and 3-D effects distort the message.
3 quick games on this lesson. Earn XP and badges as you play — your best score for each game is saved. Games are for practice and do not change your exam readiness. More games in the Mathematics Arcade.
8 items modelled on real CSEC Paper 1 questions. Choose one answer for each, then check. Aim for 80% or better. Work each item on paper first.
Write full answers, then reveal the mark scheme and tick the points you earned (16 marks in total). Show all your working — method marks count. Your answers are saved on this device.
Question 1 [9 marks]
The number of siblings of 20 students is recorded: 2, 1, 0, 3, 2, 1, 1, 2, 0, 4, 2, 1, 3, 2, 1, 0, 2, 1, 2, 3.
(a) Construct a frequency table for the data. [3]
(b) State the modal number of siblings and the type of data (discrete or continuous). [2]
(c) Calculate the angle for each sector in a pie chart of this data. [4]
Question 2 [7 marks]
A pie chart shows the favourite subject of 72 students. The sectors are: Mathematics 100°, English 80°, Science 120°, Other 60°.
(a) How many students chose each subject? [4]
(b) A school has 1 200 students. The principal surveys the 30 students in one Form 5 class about the school canteen. Give TWO reasons why this sample may be biased. [2]
(c) Suggest a better way to choose a sample of 30 students. [1]
Find these in your own past-paper booklets for extra timed practice. Items above are written in the style of these papers; any adapted from a specific question say so.