Daily Practice

Higher

21st April 2025

5 questions · Higher tier · 360 questions in this band

1
Designing Questionnaires and Surveys
A survey question offers the response options 'Never, Sometimes, Always'. State one improvement that could be made.
2
Experimental Design
A scientist tests a new plant food but only uses it on the healthiest-looking plants. Explain why this is a flawed design.
3
Median Quartiles and IQR
A data set has Q1 = 22 and Q3 = 35. State the interquartile range and explain what it measures.
4
Index Numbers
A cost index for electricity, relative to the same base year, was 120 in 2021 and 150 in 2023. Find the percentage increase in the cost of electricity from 2021 to 2023 (not from the base year).
5
Frequency Tables and Tally Charts
The frequencies for four categories are 8, 5, 12, 3. What is the total number of data items?

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