S1 (Chapter 2) NOTES

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Flashcards on S1 (Chapter 2) NOTES, created by Nazmin Shafiq on 02/03/2016.
Nazmin Shafiq
Flashcards by Nazmin Shafiq, updated more than 1 year ago
Nazmin Shafiq
Created by Nazmin Shafiq about 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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