Which of the Following Are Possible Options When Estimating a Population

Multiple Choice

Which of the following are possible options when estimating a population mean , where the population standard deviation is known?

A) We may define the limits of an interval estimate ofas.
B) We may define the limits of an interval estimate ofas
C) We may choose a smaller z-value, construct a narrower confidence interval, and achieve a higher confidence level.
D) We may choose a larger z-value, construct a wider confidence interval, and achieve a lower confidence level