Question: If all other factors are held constant, increasing the level of confidence will have what kind of effect on the width of a confidence interval?

If all other factors are held constant, increasing the level of confidence will have what kind of effect on the width of a confidence interval?

a) Increase it.
b) Decrease it.
c) Increase it or decrease it depending on whether tobt is positive or negative.
d) Have no effect on it.

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