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Description
Flashcards by Nazmin Shafiq, updated more than 1 year ago
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Created by Nazmin Shafiq
over 8 years ago
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| Question | Answer |
| What are quantitative variables? | Variables with numerical observations E.g. Size, Height, Weight |
| What are qualitative variables? | Variables with non-numerical observations E.g. Colour, Name of an object |
| What is a continuous variable? | Variable that can take any value in a given range E.g. Time, Height, Weight, Length |
| What is a discrete variable? | Variable that can only take specific values in a given range E.g. Number of objects |
| Frequency Table | Cumulative Frequency = Running total of frequencies |
| Group Frequency Table | |
| Work out: classes, class boundaries, mid-point of a class, class width | -Classes = 30-40 -Class Boundaries = 30, 40 Mid-point = 1/2 (30+40) = 35 Class width = 40-30 = 10 |
| Mode | Value that occurs most often |
| Median | Middle value when data is put in order FORMULA = n/2 -If it isn't a whole number; round the number up |
| Mean | Sum of all observations / Total no. of observations |
| Formula for combining means | Set A = Size n1, Mean X1 Set B = Size n2, Mean X2 |
| How is the median and mean affected by extreme values? | -Median = NOT AFFECTED -Mean = AFFECTED because all values are used and it gives a true measure of data |
| Mean (Frequency Table) | x is the Mid-point in grouped frequency tables |
| Working out median using Interpolation | |
| Coding | y = (x-a)/b -To find mean of original data; find the mean of coded, equate to coding used and solve |
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