Graphs & Statistics Sample size Questionnaire and survey ... · Event Tally Frequency Red III 3...
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© MissBsResources Sample size Remember the larger a sample, the more accurate the data. Make sure your sample isn’t biased (unfair). Random e.g. Select names out of a hat. Stratified Selects proportional amount of people from each group. = × Types of sampling Data collection Event Tally Frequency Red III 3 Blue IIII II 7 Checklist Unbiased. Not vague. Not personal. Time frame in the question. Three or more category options. Categories don’t overlap. ‘None’, ‘other’ and ‘more’ categories included when appropriate. Questionnaire and survey Averages Median – Middle value. Mode – Most common value. Mean – Add all the values together then divide by how many there are. Range – Subtract the smallest from the largest value (tells you about the consistency of the results). Graphs & Statistics
Transcript of Graphs & Statistics Sample size Questionnaire and survey ... · Event Tally Frequency Red III 3...
© MissBsResources
Sample sizeRemember the larger a
sample, the more accurate the data.
Make sure your sample isn’t biased (unfair).
Random
e.g. Select namesout of a hat.
Stratified
Selects proportional amount of people from each group.
𝑃𝑟𝑜𝑝𝑜𝑟𝑡𝑖𝑜𝑛 𝑜𝑓 𝑝𝑒𝑜𝑝𝑙𝑒 =𝐺𝑟𝑜𝑢𝑝 𝑠𝑖𝑧𝑒
𝑃𝑜𝑝𝑢𝑙𝑎𝑡𝑖𝑜𝑛× 𝑆𝑎𝑚𝑝𝑙𝑒 𝑠𝑖𝑧𝑒
Types of sampling
Data collectionEvent Tally Frequency
Red III 3
Blue IIII II 7
Checklist Unbiased. Not vague. Not personal. Time frame in the question. Three or more category
options. Categories don’t overlap. ‘None’, ‘other’ and ‘more’
categories included whenappropriate.
Questionnaire and survey
AveragesMedian – Middle value.
Mode – Most common value. Mean – Add all the values together then divide by how many there are. Range – Subtract the smallest from the largest value (tells you about the
consistency of the results).
Graphs &Statistics
