# Stats Unit 4 Flash Cards

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Average
Is a single value used to describe a data set
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Mode
Most common value
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Median
Is the middle value in an ordered list
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Mean
Add all of the values together and divide by the total number of values
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Modal Frequency
Is the class with the highest frequency
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Median Frequency
Is the middle value in the frequency column
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Mean Frequency
(Sum of frequency x value) divided by (Sum of the total no. of values)
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Modal Class
The class with the highest frequency
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Estimated Mean for Grouped Frequency
(Sum of frequency x mid point) divided by (Sum of total no. of values)
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Estimated Median for Grouped Frequency
(n + 1) divided by 2
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Tranforming Data
If the numbers are too big, then they can be multiplied/divided/added/subtracted to get easier numbers to handle
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Weighted Mean
(Sum of weighting x value) divided by (Sum of weighting)
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Range
Highest value minus Smallest value
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Lower Quartile for Discrete Data - Q1
Is the value that is equal to 25% or (n + 1)divided by 4
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Middle Quartile for Disctete Data - Q2
Is the value that is equal to the median/50% or (n + 1)divided by 2
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Upper Quartile for Discrete Data - Q3
Is the value that is equal to 75% or 3(n + 1)divided by 4
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Lower Quartile for Continuous Data - Q1
n divided by 4
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Middle Quartile for Continuous Data - Q2
n divided by 2
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Upper Quartile for Continuous Data - Q3
3n divided by 4
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Interquartile Range
Q3 - Q1
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Percentile
If the data is divided into 100 parts, then each part is a percentile
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Decile
If the data is divided into 10 parts, then each part is a decile
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Box Plot
Shows the distribution of a data set. It shows the min/max values, the median and the quartiles
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Outliers
Are extreme values that is more than 1.5 times below/above Q1/Q3
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Varience
Is the measure of dispersion or spread
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Standard Deviation
Is the square root of the varience
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Data Comparison
Comparing two sets of data by using the central tendancy or by using the spread
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Standardised Scores
Used to compare individual results
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Index Numbers
To see how things vary over time
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Chain Base Index Number
Is used to show how the price each year compares with the previous price
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Weighted Index Numbers
Is a way of comparing weighted means.
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## Other cards in this set

### Card 2

#### Front

Most common value

Mode

### Card 3

#### Front

Is the middle value in an ordered list

### Card 4

#### Front

Add all of the values together and divide by the total number of values

### Card 5

#### Front

Is the class with the highest frequency