Starter quiz
- A sample is a ______ of the population.
- 'subset' ✓
- Select all the biased questions.
- How many films did you watch last month?
- Intelligent people watch films. Do you watch films? ✓
- Do you not agree that you are a person who doesn't not watch films?
- Don't you think our cinema is amazing? ✓
- Art is boring and awful. Do you like art? ✓
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- Izzy writes the question: "How many books do you own?". What should Izzy consider when making response boxes for this question?
- Have a none or 0 option. ✓
- Have no overlaps between options. ✓
- Have no biased options.
- Have a "more than" option. ✓
- Have no leading options.
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- A food delivery company asks: In your opinion, how would you rate the speed of your delivery by our rivals?: [Satisfactory, Bad, Very bad]. What is wrong with their question?
- The responses are subjective. ✓
- The question has double negatives.
- The responses are biased towards negative answers. ✓
- The responses are overlapping.
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- Select all the questions that are considered to be asking for personal information.
- What is your religion? ✓
- How many books did you read last month?
- What is your weight? ✓
- What is your gender? ✓
- What type of books do you like?
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- A supermarket manager wants to find out how satisfied customers with the store. He asks customers: "Do you not find it easy to not not find what you need in this store?". Criticise their question.
- The question is leading people to answer 'yes'.
- The question is biased.
- The question contains double negatives. ✓
- The question is asking for personal information.
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Exit quiz
- Bias can be present in any ______ collected from a population and may affect the results of a statistical investigation.
- 'sample' ✓
- Select all the open questions.
- What is your favourite sport? ✓
- How often do you go swimming? ✓
- Did you vote in the last school council elections?
- Don't you agree maths is the best subject?
- How do you travel to school? ✓
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- A food delivery company designs this questionnaire. How often do you get food delivered? [once or twice /often / all the time] How could their question be improved?
- Unambiguous / clear options ✓
- “Never” option ✓
- A time frame ✓
- An option for types of takeaway
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- The owner of a café in Oakfield wants to see if they can expand to the town of Rowanwood. They ask 15 of their neighbours in Oakfield if they would use a new café. How can they improve their sample?
- Give questionnaire to people in Oakfield café
- Collect data from people in the Rowanwood ✓
- Take a larger sample ✓
- Ask more neighbours
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- The owner of a café wants to find out what their customers think of their new coffee brand. What type of sample should they take?
- A non-biased random sample
- A biased random sample ✓
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- The owner of a café in Oakfield wants to find out what their customers think of their new coffee brand. Match each type of sample to a suitable example.
- random sample⇔50 people selected at random from the population of Oakfield ✓
- biased sample⇔50 people selected at random from the café's customers ✓
- good biased sample⇔50 people who drink coffee from the café selected at random ✓
- bad biased sample⇔50 people who drink tea at the café selected at random ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Samples can be evaluated to determine the validity of any conclusions.
- A suitable sample size can vary, depending on the statistical enquiry.
- A biased sample can still be useful.
Common misconception
Biased samples are always bad.
A biased sample is sometimes useful if the sample is proportional to the population and/or it focuses on a section of the population relevant to the investigation.
Keywords
Sample - A sample is a subset of the population.
Bias - Bias can be present in any sample collected from a population and may affect the results of a statistical investigation.
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