Read the Paragraph Below and Answer the Questions That Follow

question 11

Multiple Choice

Read the paragraph below and answer the questions that follow.
Traditional musical instruments can be divided, according to how they produce sounds, into three categories: stringed, wind, and percussion. Stringed instruments produce music through the vibration of taut strings that are plucked, strummed, or bowed. The harp, the guitar, the banjo, and the violin are examples of stringed instruments. The second category contains the wind instruments, which are usually sounded by the player's breath. This category includes the clarinet, the tuba, the trumpet, and so on. The third category, percussion instruments, makes sounds when they are struck. Obvious examples of percussion instruments are drums, gongs, and cymbals. Surprisingly, the piano is also considered a percussion instrument because, when the player touches a key, a small hammer inside the piano strikes a string.
How many categories are there?

• A) three
• B) four
• C) five

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Definitions:

Factorial Research Design

Research design consisting of all possible combinations of two or more independent variables.

Marginal Mean

The arithmetic mean of values for a particular variable, considering the impact of covariates in the analysis.

Marginal Mean

The average value of a variable across levels of another variable, often used in the context of multivariate data analysis.

Marginal Means

The mean scores for each level of a factor averaged over the levels of other factors in a multifactorial experiment, often used in the analysis of variance.