Daily Practice

Foundation

3rd May 2025

5 questions · Foundation tier · 282 questions in this band

1
Spearman's Rank Interpretation
A researcher finds rs = 0.99 between a town's number of ice cream vans and its number of sunburn cases, and concludes the vans cause sunburn. Explain why this conclusion may be wrong.
2
Conditional Probability (Foundation)
A drawer has 7 black socks and 5 white socks. Two socks are taken without replacement. Find P(second sock is black given the first sock was black).
3
Estimating from Samples (Foundation)
A survey of 30 shoppers out of 900 in a store found the mean amount spent was 18.50 pounds. What is the best estimate of the mean amount spent by all 900 shoppers?
4
Spreadsheets and ICT (Foundation)
Which spreadsheet formula would you use to find the total of the values in cells B2 to B20?
5
Stratified Sampling (Foundation)
A population of 90 people is split into 3 age groups: 30 aged 18 to 30, 40 aged 31 to 50, and 20 aged 51 or over. A stratified sample of 27 is needed. Find how many from the 51-or-over group should be sampled.

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