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

question 52

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.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

---

Definitions:

Return On Assets

A financial ratio that indicates the percentage of profit a company earns in relation to its overall resources. It demonstrates how effectively a company is using its assets to generate earnings.

Average Collection Period

A measure of the average number of days it takes a company to collect payments from its credit sales.

Du Pont Analysis

A method of performance measurement that breaks down return on equity into three component parts: profit margin, asset turnover, and financial leverage.

Pearson's Product-moment

A correlation coefficient that measures the linear correlation between two variables X and Y, giving a value between +1 and -1.