If a sample of size n is taken from a normal population with a finite variance,then the statistic follows the distribution with degrees of freedom.
A) (n + 1)(n − 1).
B) n + 1.
C) n − 1.
D) n.

Question

If a sample of size n is taken from a normal population with a finite variance,then the statistic  follows the  distribution with degrees of freedom.
A) (n + 1)(n − 1). 
B) n + 1. 
C) n − 1. 
D) n.

Quizplus · Accepted Answer

The t-distribution with degrees of freedom df is used when the population variance is unknown and must be estimated from the sample. The formula for the degrees of freedom is df = n - 1. Therefore, the correct choice is C, n-1.

If a Sample of Size N Is Taken from a Normal