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S1 (Chapter 2) NOTES
Fichas del conjunto (15)
- 1What are quantitative variables?Variables with numerical observations
E.g. Size, Height, Weight - 2What are qualitative variables?Variables with non-numerical observations
E.g. Colour, Name of an object - 3What is a continuous variable?Variable that can take any value in a given range
E.g. Time, Height, Weight, Length - 4What is a discrete variable?Variable that can only take specific values in a given range
E.g. Number of objects - 5Frequency TableCumulative Frequency = Running total of frequencies
- 6Group Frequency Table
- 7Work 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
- 8ModeValue that occurs most often
- 9MedianMiddle value when data is put in order
FORMULA = n/2
-If it isn't a whole number; round the number up - 10MeanSum of all observations / Total no. of observations
- 11Formula for combining meansSet A = Size n1, Mean X1
Set B = Size n2, Mean X2
- 12How 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 - 13Mean (Frequency Table)x is the Mid-point in grouped frequency tables
- 14Working out median using Interpolation
- 15Codingy = (x-a)/b
-To find mean of original data;
find the mean of coded, equate to coding used and solve
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- Fichas sobre S1 (Chapter 2) NOTES, creado por Nazmin Shafiq el 02/03/2016.
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- Nazmin Shafiq
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