Statistics Test 3

• coefficeint of determination


  correlation coefficient squared
• causation


  one variable changes BECAUSE another one changes
• correlation


  one variable changes AS another one changes
• probability


  theoretical math
• statistics


  applied math
• interquartile range


  Q3-Q1
• How to find coefficient of variation

  (standard deviation/mean) X 100
• Percentiles


  Ranking or positioning of data points
• Mean plus and minus 3 standard deviations

  99.7%
• Mean plus and minus 2 standard deviations

  95%
• Mean plus and minus 1 standard deviation

  68%
• Characteristics of Normal Distribution


  1. bell curve2. Symmetrical3. Curve never touches x-axis
• Coefficient of variation


  Standard deviation in percentage form
• Standard deviation


  Average distance of all data points from the mean
• Sample


  A part (or segment) of the population
• Population


  Everything (example: testing a medication on every single person in the world)
• Measures of central tendency

  Mean, median, and mode
• Range


  Largest data point minus smallest data point
• Trimmed mean


  Cut off the outliers
• Mean


  Average
• Median


  Center of the data
• Mode


  Most frequent data point