Daily Practice

Higher

15th February 2025

5 questions · Higher tier · 360 questions in this band

1
Regression and the PMCC
For a data set, Sxy = 45 and Sxx = 60. Find the gradient b of the regression line.
2
Stratified Sampling (Higher)
A stratified sample gives 8 people from a stratum of 80, out of a population of 400. What is the total sample size?
3
Capture Recapture
100 fish are marked and released. A second catch of 40 fish contains 8 marked fish. Estimate the fish population.
4
Crude and Standardised Rates
Explain why comparing the crude death rates of a seaside retirement town and a university town could be misleading.
5
Conditional Probability (Higher)
A box has 10 pens: 6 blue and 4 black. Two pens are picked without replacement. Find the probability that both are blue.

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