Daily Practice

Foundation

13th September 2024

5 questions · Foundation tier · 282 questions in this band

1
Combined Mean
Group A has 4 items with mean 12. Group B has 4 items with mean 20. Find the combined mean.
2
Designing Questionnaires and Surveys
What is wrong with the question 'How old are you and do you smoke?'
3
Experimental Design
In a medicine trial, half the patients receive the real drug and half receive a dummy pill, and neither the patients nor the doctors know who received which until after results are recorded. What is this type of trial called, and why is it used?
4
Median Quartiles and IQR
Find the median of: 4, 7, 9, 12, 15.
5
Index Numbers
An item has an index number of 88 compared to its base year. State whether the value has increased or decreased, and by what percentage.

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