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General information on data literacy

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**HA 29 .S2365 2017** Statistics for People Who (Think They) Hate Statistics

**QA 276 .W458 2013** Naked statistics

**QA 276.12 .v53 2010** What is a p-value anyway?

**QA 276.15 .S754 2016** The seven pillars of statistical wisdom

**QA 278.2 .R33 2017** Statistics (the Easier Way)

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(an estimate of the "center" of a distribution of values)

- Found by ordering the numbers and finding the middle number
- When the list of numbers is even, the 2 middle numbers are averaged for the median
- Also known as the 50th percentile

- Found by adding up a list of numbers and dividing by the count of numbers in the list

- Found by counting those numbers that repeat
- Those that repeat the most are the "mode"
- There may be more than one "mode"
- There may be no mode

(spread of the values around the central tendency)

__Standard Deviation__: extent of deviation for a group as a whole
__Quartiles__: Along with the Median, these are values that devide your data into 4 parts.
**Distribution**

- Find the Mean
- Subtract the mean from the value of each item
- Square the result
- When finished, sum all the results
- Divide that answer by a number that is 1 less than the total number of items
- Take the square root of the quotient

- For the first quartile (Q1) find the middle number between the smallest number and the median
- For the third quartile (Q3) find the middle number between the largest number and the median

(summary of the frequency of individual values or ranges of values for a variable)

__Frequency Distribution:__ A table showing the values in a sample and how often they occur

- Calculated by taking the standard deviation (or standard error)
- Dividing it by the square root of the number of observations (> 30 if the std dev is from the sample)
- Multiplying the result by the Confidence Interval (1.96 for a 95% confidence level and 2.576 for 99% confidence level)

- Last Updated: Oct 1, 2021 10:15 AM
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