Which of the Following Statements About a Weighted Mean Is

question 13

Multiple Choice

Which of the following statements about a weighted mean is true?

• A) The weighted mean is always equal to the arithmetic mean.
• B) The weighted mean can only be reported if the sample size is equal in each group.
• C) The weighted mean is used to compute the combined mean for two or more samples of scores in which the number of scores in each sample is disproportionate or unequal.
• D) The weighted mean is heavier than an arithmetic mean.

---

Definitions:

Variability

The extent to which data points in a set differ from each other and from the mean, indicating the spread or dispersion of the dataset.

Double-blind Design

An experimental design in which neither the participants nor the experimenters know who is receiving a particular treatment, used to eliminate bias in research findings.

Confounds Increased

The introduction of variables or factors that obscure or confuse the relationship between the variables being studied, complicating the interpretation of results.

Reliability

The degree to which the result of a measurement, calculation, or specification can be depended on to be accurate across different instances.