statistics

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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

Card Set Information

 Author: kimkrak ID: 309207 Filename: statistics Updated: 2015-10-07 21:18:41 Tags: psychology Folders: Psyc Description: psyc test 2 lessons 9-12 Show Answers:

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