8-15. Suppose a population variableXhas an unknown mean but a known variance 2. Arandom sample of...

8-15. Suppose a population variableXhas an unknown mean μ but a known variance

σ2. Arandom sample of size n is selected. Are the following quantities statistics?

(a) X

(b) X + μ

(c) X + σ2

(d) X3

(e) X2 + μ − σ2

(f)

1 2

min {Xi}

(g) X/

√

n

(h) X/σ

(i) logXi