Daily Practice

Higher

12th December 2025

5 questions · Higher tier · 360 questions in this band

1
Regression and the PMCC
The equation of a regression line is y = 3 + 2x. Find y when x = 5.
2
Stratified Sampling (Higher)
A factory has 3 departments with 40, 60 and 100 workers (200 total). A stratified sample of 50 workers is taken. How many should come from the department of 60 workers?
3
Capture Recapture
A conservationist worries that marking makes animals easier for predators to catch, reducing their survival before the second sample. Explain how this would affect the population estimate.
4
Crude and Standardised Rates
A standard population has 10,000 people aged 65 or over. The age-specific death rate for this age band in Town A is 30 per 1000. Calculate the expected number of deaths in this age band for the standard population.
5
Conditional Probability (Higher)
Using the bag in the previous question, find P(second is green given first is red).

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