Psychology Study Guide Exam 1 Textbook Clarifications Assumptions of Science (pg. 6):
Nature is lawful
In Psychology, it is impossible to say with great certainty how a person will behave (not as much precision) Psychology has a limited number of laws,
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Reliability and Validity
Reliability
o Observed score = true score + method error
o Reliability =
Method error = random error + systematic error
o Five methods to asses reliability
Retest method (testretest reliability)
Make two measurements and see i
TTests
Basics about t tests
o T curve is flatter than normal curve
o As sample size increases, becomes more like normal curve
o Degrees of freedom
Number of degrees of freedom determines t curve shape
df = n1
confidence intervals for the mean ( unknow
Frequency Distribution
Organizing and displaying data
o Guidelines for grouping
Number of classes
Exclusivity  one cannot fall into two classes
Equal width = same number in each class (ex: 1100, 101202)
Constructing frequency
o Find range of scores
How Shyness Affects Levels of Stress
Amanda Hinh
Trinity University
How Shyness Affects Levels of Stress
Abstract
Many factors influence a persons level of stress. One factor of interest is shyness and its
resulting poor social interaction. Interaction wi
Amanda Hinh
PSYC 24011
24 Oct 2011
Computer Assignment 2
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predict their height when they reach maturity. I also suspect that the level of Hormone X that a
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S tatistics Test #3 Inferential Statistics Inferential statistics allow researchers to estimate whether a sample is r epresentative of a certain population "Statistical significance" reveals whether the characteristics of a sample are likely to exist in t
E xam 2 Study Guide Statistics of variabili ty (provide info about degree to which scores in a dataset differ f rom one another)
Summarize and describe the extent to which scores in a distribution differ f rom each other How consistent the scores are How
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