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Research Exam 2 Ch 6 7 8
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What is a relationship between two variables when the change of one variable is associated with a change in the other
relationship
What type of relationship occurs when one variable's value increases causing the other variable to also increase
positive
what type of relationship occurs when one variable's value increases and the other's value decreases
negative
What type of scale is a measurement scale with a range of numerical values having equal distance between them
interval
What is the Pearson r statistic and what does it determine
-1 to +1
The strength of the relationship between two variables.
close to -1 (negative relationship)
0 (independent of each other)
+1 (positive relationship)
What is r is -0.8? +0.8? -0.5? +0.5? 0?
strong neg
strong pos
moderate neg
moderate pos
weak
6 classical features of experimental study
well-defined target population
adequate sample size
random assignments
control of extraneous influences and bias
consistent delivery of interventions
low level of missing data
What is the right way to determine sample size for correlational and experimental studies
power analysis
3 limitations of randomized experiments
Findings are average (not unique)
Weak generalizability
Controlled manner (not everyday)
3 key features differientiating experimental research from quasi-expiremental
random assignments
tight control
comparison group
What type of study draws a sample from a larger population and classifies them into two distinct groups (those with risk factors and those without it)
Cohort
When are cohorts identified in a study
After exposure of risk factor and before the outcome of interest develops
How are cohort studies different than experiments
contrasting groups are not created by random assignment, based on exposure to risk factor
What is it called if the difference is a determinent of the outcomes being studied and is unequally distributed into two groups
confounding variable
Name four types of data measurements
nominal
ordinal
interval
ratio
Author:
jwhughes
ID:
296016
Card Set:
Research Exam 2 Ch 6 7 8
Updated:
2015-02-17 18:41:32
Tags:
research
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Ch 6, 7, & 8
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