What Is the Difference Between a Posttest-Only Design and a Pretest/posttest

question 6

Essay

What is the difference between a posttest-only design and a pretest/posttest design? Provide both a benefit and a disadvantage of using a pretest/posttest design.

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Definitions:

Population Means

The average value of a numerical characteristic in a population, representing the central tendency of the population.

Confidence Interval

A confidence interval is a range of values, derived from sample statistics, used to estimate the true value of a population parameter with a certain degree of confidence.

Normally Distributed

Describes a type of continuous probability distribution for a real-valued random variable where the data forms a symmetric, bell-shaped curve about the mean.

Variances Assumed

A condition in statistical analysis where it is presumed that the variances of two or more populations are equal, important in certain tests like ANOVA.