Stat 1124: CH 3

The flashcards below were created by user lindaphann on FreezingBlue Flashcards.

  1. What is a density function?
    A smooth curve drawn over the histogram is a mathematical model aka ia density function
  2. What does a smooth curve describe?(aka density curve)
    It describes the overall pattern of a distribution
  3. What shapes do density curves come in?
    They come in any imaginable shape!
  4. What are some properties of density curves?
    Image Upload
  5. What is Normal distributions?
    Normal distrubutions are a family of symmetrical, bell shaped density curves defines by a mean (mu) and a standard deviation(sigma)
  6. What are three characteristics of normal distrubution?
    Image Upload
  7. What is the Emprircal rule?
    68-95-99.7Image Upload
  8. How to calculate the area under the normal curve?
    Image Upload
  9. What does a z-score measure?
    A z-score measure the number of standard deviations that a data value x is from the mean "u".
  10. When x is larger than the mean, z-score is ______
  11. WHen x is smaller than the mean, z-score is ________-
  12. How to calculate z-scores (Just look)
    Image Upload
Card Set:
Stat 1124: CH 3
2012-01-17 08:04:53
Stat 1124

Chapter 3: The Normal Distributions
Show Answers: