The T-Test for Two Means Is Appropriate Whenever the Two $\sigma_{1}, \sigma_{2}$

question 20

Multiple Choice

The t-test for two means is appropriate whenever the two population variances ( $\sigma_{1}, \sigma_{2}$ ) are ______.

• A) unknown
• B) known
• C) normally distributed
• D) beyond the critical value for statistical significance

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Definitions:

Hypothesis

A proposed explanation made on the basis of limited evidence as a starting point for further investigation.

Statistical Tests

Quantitative methods used to determine whether hypotheses about data are supported or refuted.

Primary Research

Collection of original data or firsthand information through methods like surveys, interviews, or experiments.

Experiments

Controlled procedures carried out to discover, test, or demonstrate a hypothesis or the effect of one variable on another.