Maths vocabulary · Unit 6 Collecting data

Practice40 questions

Glossary — every term in Unit 122 terms

Term	What it means	Example
data	Information that has been collected.	Heights of 30 learners.
statistical question	A question answered by collecting data that varies.	Which sport is most popular in Year 7?
prediction	What you expect the data to show, written before collecting it.	I predict most learners walk to school.
primary data	Data you collect yourself.	Measuring your class.
secondary data	Data somebody else collected.	Figures from a website.
categorical data	Data that is a word or a label.	Eye colour.
discrete data	Numerical data you count.	Number of pets.
continuous data	Numerical data you measure.	Height in centimetres.
tally chart	A chart for counting in fives as data arrives.	卌卌 \|\| = 12.
frequency	How many times a value or category occurs.	12 learners have a dog.
frequency table	A table of categories and their frequencies.	It usually ends with a Total row.
class interval	A group measurements are sorted into.	150 ≤ h < 160.
grouped data	Data sorted into class intervals.	Used for continuous data.
population	Every member of the group being studied.	All 800 learners.
sample	The part of the population you collect data from.	40 of the 800.
census	A survey of the whole population.	Asking all 800.
sample size	How many members are in the sample.	A sample size of 40.
random sample	Every member has an equal chance of being chosen.	Names drawn from a hat.
systematic sample	Chosen by a fixed rule.	Every 10th name.
convenience sample	Whoever is easiest to reach.	Your own friends.
bias	When some members are more likely to be chosen than others.	Surveying sport at a football club.
representative	Reflecting the population fairly.	A random sample usually is.

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