In a Situation Where the Population Standard Deviation Is Known

question 123

Multiple Choice

In a situation where the population standard deviation is known and we wish to estimate the population mean with 90 percent confidence, what is the appropriate critical value to use?

• A) z = 1.96
• B) z = 2.33
• C) z = 1.645
• D) Can't be determined without knowing the degrees of freedom.