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Part 3 Psych 211 midtermInternal validity & reliability

Terms in this set (5)

Internal validity & reliability
Concerned with whether the study produced a single, clear explanation of the relationship between two variables
- Confounding variables - Selection bias - History - Maturation - Repeated testing - Instrument change - Differential attrition - Experimenter bias
■ Are you measuring the construct you are trying to measure?

reliability-The stability or consistency of a measurement
■ Based on the idea that the variable is constant
statistical significance (probability level that findings were due to chance)
Significance testing (alpha level)
-interprets the test statistic -indicates the probability that the result occurred by chance
-goal is results that are extremely unlikely to be due to chance (.05, .01, .001) -significance is reported using p values (probability that the results are due to chance).
mean, median, & mode - what are they and how to "compute" them
Mean Conceptually- it is the amount each individual would receive if the total were divided equally M= SUM X/N (the sum of all the scores/# of scores)
Median - Used when the mean is not a good measure of central tendency
•It is the score that divides the distribution in half
mode-Score with the most frequency • Distributions can be bimodal or multi-modal
inferential statistics
Help answer questions as to what conclusions are justified Look at limited information from a sample to infer characteristics of a population
descriptive statistics
organize and summarize data
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