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17 Cards in this Set
- Front
- Back
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What is Cluster Sampling and When can it be used? |
Cluster sampling can be used when the population is in groups. A random sample of these groups is selected and all the items in the selected groups are included in the sample. Cluster sampling is a practical way to bring down the costs of sampling. |
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What is Quota Sampling and When can it be used? |
Quota Sampling involves splitting the population into groups with certain characteristics (e.g. age, gender) and selecting a given number fro each group. For example, a market researcher might ask 10 adults and 10 children about their reaction to the 2015 GCSE results. It is also often used in market research and polling. |
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What is Systematic Sampling? |
In Systematic Sampling items are selected from the population at regular intervals either in time or in space. For example, every 5th car that passes a location or every 3rd house on a street. |
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What are Advantages and Disadvantages with Simple random sampling? |
Advantage - Unbiased (Every member of the population has an equal chance of being selected Disadvantage - Can be time consuming, and results are less representative than Stratified Sampling |
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What are Advantages and Disadvantages with Stratified? |
Advantages - Most Representative and it is unbiased. Disadvantages - Harder to analyse data, Need to know about the strata in advance. |
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What are the Advantages and Disadvantages with Cluster Sampling? |
Advantages - It is quicker than random sampling. Disadvantages - Leads to less reliable data than random sample |
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What are the Advantages and Disadvantages with Systematic Sampling? |
Advantages - Can be more convenient Disadvantages - Not a random sample, so less representative. |
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What are the Advantages and Disadvantages with Quota Sampling? |
Advantages - It is Quicker and Cheaper Disadvantages - Not a random sample, so less representative. |
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What are Open Questions? |
Open questions allow a wide variety of responses. e.g. What do you think about programmes on TV? |
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What are Closed Questions? |
Closed Questions restrict the possible replies given and usually have a set of response boxes for the respondent to tick. e.g. Are you over 18 years old? |
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What are the Advantages and Disadvantages with cumulative frequency diagrams? |
Advantages - It shows more information about the distribution. Disadvantages - It is harder to interpret, The extreme values of the distribution are not known. |
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What are the Advantages and Disadvantages with Box Plots? |
Advantages - They are easier to interpret, They show the extreme values. Disadvantages - They show less detail. |
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What are the Advantages and Disadvantages of Range as a measure of spread? |
Advantages - Easy to find. Disadvantages - Affected by extreme values, No use for advanced work |
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What are the Advantages and Disadvantages of Standard deviation as a measure of spread? |
Advantages - Used for advanced work, Uses all the data. Disadvantages - Affected by extreme values, Harder to calculate. |
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What are the Advantages and Disadvantages of InterQuartile Range as a measure of spread? |
Advantages - Not affected by extreme values. Disadvantages - Difficult to calculate, Only uses central 5% of the distribution. |
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What is a Stratum? |
A Stratum is a group in the population. |
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What situations can use normal distribution? |
- People's heights - People's blood pressure - People's body mass index - Size of car parts from a factory |
