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

question 26

Multiple Choice

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.Assuming a two-tail test and $\alpha$ = .05, the observed z value is ___.

• A)-2.12
• B)-2.25
• C)-5.58
• D)-15.38
• E)-20.68

---

Definitions:

Juvenile Delinquency

Conduct in a child or adolescent characterized by illegal activities.

Homicide

The deliberate and unlawful killing of one person by another; murder.

High School

An education institution for students, typically between the ages of 14 and 18, that follows primary school and precedes higher education.

Juvenile Delinquency

Illegal or antisocial behaviors committed by a person under the age of majority.