Statistics Quest

Practice

Practise until it sticks

Choose a topic, a skill or a difficulty. Calculation exercises have new versions with fresh numbers once you have solved them, so you can practise the method rather than memorise an answer.

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Practice, difficulty 1 of 3

Parameter or statistic?

Not started

Classify each bold number as a parameter (describes the whole population) or a statistic (computed from a sample).

From the payroll system, the mean salary of all 3,250 employees of a ministry is 14,820 SAR.
In a random sample of 400 voters, 57% support a new transport levy.
Quality control measures 30 bolts from today's run; their mean length is 50.08 mm.
Every player in the league was tested; 3.2% failed the fitness standard.
A clinic reviews 120 randomly chosen patient files and finds 18% have incomplete allergy records.