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A journalist is going to do a survey to find out whether people aged 15 or less spend more time playing computer games than people aged more than 15 - OCR - GCSE Maths - Question 22 - 2021 - Paper 1
Question 22
A journalist is going to do a survey to find out whether people aged 15 or less spend more time playing computer games than people aged more than 15. The journalist... show full transcript
Worked Solution & Example Answer:A journalist is going to do a survey to find out whether people aged 15 or less spend more time playing computer games than people aged more than 15 - OCR - GCSE Maths - Question 22 - 2021 - Paper 1
Step 1
Give one reason why the journalist's sample is unlikely to give reliable information.
Answer
The sample is unlikely to give reliable information because it is not representative of the entire population. Gathering data only from the first 20 people leaving a specific shop may introduce selection bias, as these individuals may not reflect the broader demographics or behaviors of all 15-year-olds and those older than 15.
Step 2
Make three suggestions to help the journalist obtain a sample that may give more reliable information.
Answer
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Use random sampling by selecting participants at various times throughout the day, ensuring a mix of ages and demographics, rather than just the first 20 individuals.
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Increase the sample size to include more participants from different locations and times, which can help balance out any anomalies or biases that occur in a smaller group.
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Stratify the sample by age and other relevant factors (such as gender or socioeconomic status) to ensure that the sample reflects the population's diversity accurately.