A Researcher Constructs a Five-Item Measure of Attitudes Toward National

question 7

Multiple Choice

A researcher constructs a five-item measure of attitudes toward national health insurance. The average intercorrelations among the items is r_ii = .40. Using the Spearman-Brown formula, he finds that R^SB = .77. What is the reliability of the scale as a whole?

• A) .77
• B) .50
• C) .40
• D) Cannot be determined without knowing the sample size.

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Definitions:

Plane-Polarized Light

Plane-Polarized Light consists of light waves that oscillate in a single plane, often used in optical studies to analyze molecular structures.

Carbon Dioxide

A colorless, odorless gas composed of one carbon and two oxygen atoms, widely known for its role in the carbon cycle and as a greenhouse gas.

Water

A clear, colorless, odorless, and tasteless liquid, composed of hydrogen and oxygen (H2O), essential for most plant and animal life and the most widely used solvent.

Glucose

A simple sugar that is an important energy source in living organisms and is a component of many carbohydrates.