Question

When estimating a population mean μ, where the population standard deviation σ is known, we can:
a. choose a larger z value, construct a wider confidence interval, and achieve a lower confidence level
b. choose a smaller z value, construct a narrower confidence interval, and achieve a higher confidence level
c. define the limits of an interval estimate of μ as x ± zα/2σ/√n
d. define the limits of an interval estimate of μ as x ± tα/2·5/n

Answer 1

(c) define the limits of an interval estimate of ƒÊ as x } zƒ¿/2ƒÐ/ãn
Because sigma is known