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Which of the following correctly describes the changes in the $t$-distribution when the degrees of freedom decreases?

A

The center decreases, the spread increases and the shape becomes less normal.

B

The center decreases, the spread increases and the shape becomes more normal.

C

The center increases, the spread decreases and the shape becomes less normal.

D

The center remains the same, the spread decreases and the shape becomes more normal.

E

The center remains the same, the spread increases and the shape becomes less normal.

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