Threats to Internal Validity of Quasi-Experiments Include

question 27

Multiple Choice

Threats to internal validity of quasi-experiments include

• A)failure of randomization.
• B)failure to follow the treatment protocol.
• C)attrition.
• D)all of the above with some modifications from true randomized controlled experiments.

---

Definitions:

Sample Size

The number of observations or units in a sample taken from a population for the purpose of statistical analysis.

Width of Confidence Interval

The measure of the precision or uncertainty of an estimation, calculated as the difference between the upper and lower bounds of the interval.

Sample Size

The quantity of collected data points or observations from a population aimed at conducting statistical analysis.

Upper Limit

The highest value that a variable or parameter can assume in a given context.