# Research Exam 2 Ch 6 7 8

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1. What is a relationship between two variables when the change of one variable is associated with a change in the other
relationship
2. What type of relationship occurs when one variable's value increases causing the other variable to also increase
positive
3. what type of relationship occurs when one variable's value increases and the other's value decreases
negative
4. What type of scale is a measurement scale with a range of numerical values having equal distance between them
interval
5. 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)
6. What is r is -0.8? +0.8? -0.5? +0.5? 0?
• strong neg
• strong pos
• moderate neg
• moderate pos
• weak
7. 6 classical features of experimental study
• well-defined target population
• random assignments
• control of extraneous influences and bias
• consistent delivery of interventions
• low level of missing data
8. What is the right way to determine sample size for correlational and experimental studies
power analysis
9. 3 limitations of randomized experiments
• Findings are average (not unique)
• Weak generalizability
• Controlled manner (not everyday)
10. 3 key features differientiating experimental research from quasi-expiremental
• random assignments
• tight control
• comparison group
11. 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
12. When are cohorts identified in a study
After exposure of risk factor and before the outcome of interest develops
13. How are cohort studies different than experiments
contrasting groups are not created by random assignment, based on exposure to risk factor
14. What is it called if the difference is a determinent of the outcomes being studied and is unequally distributed into two groups
confounding variable
15. 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 Folders: Description: Ch 6, 7, & 8 Show Answers: