The Frequency of LBW in the United States _____ Throughout

question 54

Multiple Choice

The frequency of LBW in the United States _____ throughout most of the twentieth century, and then _____ in the 1990s and early 2000s.

• A) decreased; increased
• B) increased; decreased
• C) decreased; remained stable
• D) increased; remained stable

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Definitions:

Factor A

Represents an independent variable or input in an experiment or study that is manipulated to observe its effect on a dependent variable.

Residual Variance

The variance in observations not explained by the independent variables in a regression model, representing the unpredicted part of a dependent variable.

Two-way ANOVA

This test analyzes how two categorical variables affect a continuous target variable.

Interaction

In statistics, it refers to a situation where the effect of one variable on an outcome is changed by the level of another variable.