The number of degrees of freedom associated with the t-test, when the data are gathered from a matched pairs experiment with 10 pairs, is:

A) 10
B) 20
C) 9
D) 18
E) 14

Degrees Of Freedom

The number of independent values within a statistical calculation that are free to vary without violating any constraints.

T-Test

A T-test is a statistical test used to compare the means of two groups to see if they are significantly different from each other, commonly used when data follows a normal distribution.

Matched Pairs Experiment

An experimental design in which the participants are paired up according to a specific criterion, ensuring that each pair is as similar as possible, and then different treatments are applied to the members of each pair.