Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

11 Cards in this Set

  • Front
  • Back
mean value
the expected value of the random variable, x. it is a weighted average in which the possible values of x are weighted according to their probablilites of occurance
the value that occurs with the greatest frequency in a set of data
a value that has just as many observations that are higher as it does observations that are lower. it is the second quartile
the condition in which a distribution tails off to either the left or the right, exhibiting a lack of symmetry
positively skewed
right skewed data
negatively skewed
left skewed data
symmetrically skewed
mean = Q2
the difference between the highest and lowest values in a set of data
a measure of dispersion based on the squared differences between observed values and the mean
standard deviation
a measure of dispersion, calculated as the positive square root of the variance
empirical rule
for distributions that are bell-shaped and symmetrical, about 68% of the observations will fall within 1 standard deviation of the mean, with about 95% falling within 2 standard deviations, and practically all of the observations falling within 3 standard deviations of the mean