statistics

Card Set Information

Author:
kimkrak
ID:
309207
Filename:
statistics
Updated:
2015-10-07 17:18:41
Tags:
psychology
Folders:
Psyc
Description:
psyc test 2 lessons 9-12
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user kimkrak on FreezingBlue Flashcards. What would you like to do?


  1. statistics deals with
    collection, classification, analysis, interpretation ( of numeral facts or data)
  2. nominal
    • numbers ( simple count number of times something has occurred)
    • simplest data
  3. ordinal
    • order
    • these numbers cannot be averaged

    • who came 1st 2nd 3rd
    • intervals between each are unknown
  4. interval and ratio
    • measurement
    • intervals known and equal
    • ratio has absolute zero point
  5. measure of central tendency
    • mode
    • median
    • & mode
  6. mode
    • occurs most
    • not influenced by extreme scores
  7. median
    • number in middle
    • not influenced by extreme scores
    • ideal for ordinal
  8. mean ( average )
    • DISTORTED BY EXTREME VALUES
    • interval or ratio
  9. descriptive statistics
    number that summarize set of research data
  10. standard deviation
    average amount of scores deviated from the mean
  11. normal distribution
    • represents data about how certain human characteristics are dispersed in the population
    • the mean median and mode are all in the same place
  12. 68% of the scores fall within ____ standard deviationĀ of the mean
    95
    99
    • 1
    • 95 - 2
    • 99 - 3
  13. skewed
    • extreme values (outliers)
    • the MEAN (average) is pulled toward the outliers
  14. correlation=
    relationship
  15. scatter plots
    best way to examine data on two variables at once
  16. positive correlation
    one predicts the other
  17. negative
    • negative slope
    • presence of one predicts the absence of the other
  18. no correlation
    no relationship between variables
  19. correlation coefficent
    • strength of association of two variables
    • +1 is strongest possible
    • 0 is no correlation
    • -1 is strongest possible negative

    +1 & -1 are equal in strength

    lowercase r is the symbol
  20. correlation does not imply
    causation
  21. propability =
    # of ways an event can occur/ # of possible outcomes
  22. 5% significance is
    sufficent
  23. null hypothesis
    • opposite of hypothsis being tested
    • researcher tries to reject it
  24. type one error
    • to lenient
    • 50 to 50
    • or 1 in 3
    • researcher may be eager to reject null hypotheis even if it is true
  25. type 2 error
    • 1 in a 100
    • 1 in a 1000
    • too strict
    • researcher compelled to accept null hypothesis
  26. meta anaylasis
    pool data from multiple studies until they arrive at an answer

What would you like to do?

Home > Flashcards > Print Preview