Standard Deviation

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https://towardsdatascience.com/a-visual-interpretation-of-the-standard-deviation-30f4676c291c

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(a)  

What are the two ways to summarize the numbers in descriptive statistics?

​ ​ ​ (a)   and ​ (b)  

• quantifying their similarities
• quantifying their differences
• mean
• median
• mode
• measures of central tendency
• standard deviation
• measures of variability

What are the "measures of central tendency"?

(a)  

What are the "measures of variability"?

(a)  

What is the purpose of standard deviation?

What does the 4.75 represent in the scatterplot?

It is the (a)  

Why do we square the difference between the mean and each data value when calculating standard deviation?

• I don't know

• to calculate the distance between each point and the mean

• so the sum of the data values doesn't just equal 0

• to find the variation of the data

Why do we calculate the sum of squares when finding standard deviation?

• to find the variation of the numbers

• to find it's area

• for inference tests

• to calculate the total variability

What is the reason for taking the square root of the variance?

What value did they calculate for the standard deviation?

Mathematical Equivalence

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