Lucy Baker is analyzing demographic characteristics of two television programs, Lost (population 1)and Heroes (population 2).Previous studies indicate no difference in the ages of the two audiences.(The mean age of each audience is the same.)Her staff randomly selected 100 people from each audience, and reported the following: ₁ = 43 years and ₂ = 45 years.Assume that $\sigma$₁ = 5 and $\sigma$₂ = 8.With a two-tail test and $\alpha$ = .05, the critical z values are ___. A)-1.64 and 1.64 B)-1.96 and 1.96 C)-2.33 and 2.33 D)-2.58 and 2.58 E)-2.97 and 2.97

Question

Quizplus · Accepted Answer

A two-tail test with a 0.05 significance level means we need to find the z values that include 0.025 in each tail. Using a standard normal distribution table, the critical z values are approximately -1.96 and 1.96. Therefore, the answer is B.

Lucy Baker Is Analyzing Demographic Characteristics of Two Television Programs σ\sigmaσ

Lucy Baker Is Analyzing Demographic Characteristics of Two Television Programs $\sigma$