Question

What “confidence” would be associated with each
of the following intervals? Assume that the random variable
Y is normally distributed and that σ is known
(a)

y −1.64 · √σ
n , y +2.33 · √σ
n

(b)

−∞, y +2.58 · √σ
n

(c)

y −1.64 · √σ
n , y