Examlex
A random sample of size 10 produced a sample mean equal to 12 and a standard deviation equal to 0.15. Based on this information, the margin of error associated with a 90% confidence interval estimate for the population mean is 1.8331.
Maturation Effects
Changes or developments in participants that occur over time naturally, rather than as a result of experimental treatment.
One-group Pretest-posttest Design
An experimental design where a single group is tested before and after an intervention, without the use of a control group.
Internal Validity
pertains to the extent to which a study or experiment accurately establishes a causal relationship between variables, minimizing the influence of external factors.
Systematic Changes
Alterations that follow a consistent, predictable pattern and are often due to specific causes or interventions.
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