The Number of Degrees of Freedom Needed to Construct 90

question 40

Multiple Choice

The number of degrees of freedom needed to construct 90% confidence interval for the difference between means when the data are gathered from paired samples,with 15 observations in each sample,is

• A)30.
• B)15.
• C)28.
• D)14.

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Definitions:

Experimental Design

A structured research approach that manipulates one variable to determine its effect on another variable, allowing for causal inferences.

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A global system of interconnected computer networks that use the Internet protocol suite to communicate between networks and devices.

Experiments

A research method involving manipulation of variables to test hypotheses and determine cause-and-effect relationships.