Collecting and classifying dataIB MYP Maths Extended: Mind map

Exam questions on Collecting and classifying data

1. A school survey records four pieces of information about each student: shoe size, the colour of their bag, their height in centimetres and the number of siblings.
   Explain why shoe size is discrete data.2 marks
2. A town council wants to find out how residents travel to work. It has a list of all $8\,000$ residents, of whom $3\,200$ live in the north of the town and $4\,800$ live in the south.
   A councillor suggests surveying only people who are at the railway station at 8 am on a weekday. Explain why this sample would be biased.2 marks
3. A student wants to find out how long pupils in her school spend on social media each day. She asks: "You spend too much time on social media, don't you?" The answer boxes are: "A lot", "Some" and "Hardly any".
   Identify three faults with the question and the answer boxes.3 marks