Which of the Following Is True of Variance

question 109

Multiple Choice

Which of the following is true of variance?

• A) The formula to calculate variance of a population is not the same as the formula to calculate variance of a sample.
• B) Its value is inversely proportional to the degree to which the data is spread from the mean.
• C) It only requires the middle 50% of data to be calculated.
• D) It is the square root of standard deviation.

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Definitions:

Matched Control Group

A group of subjects that is equivalent to the experimental group in key characteristics but does not receive the experimental treatment or intervention.

Error Variance

The portion of variation in a set of observations that arises from random factors as opposed to systematic influences.

Imperfect Matching

A scenario in research where participants in different groups or conditions are not perfectly comparable due to varying characteristics that may affect the outcome.

Crossover Design

A research method where participants receive more than one treatment in a specific order, allowing comparison of different interventions within the same group.