A Random Sample of 100,000 Credit Sales in a Department

question 73

Multiple Choice

A random sample of 100,000 credit sales in a department store showed an average sale of $87.25. From past data, it is known that the standard deviation of the population is $20.00. What is the 95% confidence interval of the population mean?

• A) $87.22 to $87.28
• B) $87.13 to $87.37
• C) $19.97 to $20.03
• D) $19.88 to $20.12

---

Definitions:

Marital Happiness

The degree of satisfaction and joy that individuals derive from their marriage or matrimonial relationship.

Self-Reports

A method by which individuals provide subjective information or accounts of their own behavior, experiences, or characteristics.

African Americans

An ethnic group in the United States with ancestors who were primarily brought from Africa to North America as slaves between the 16th and 19th centuries.

Virginity

The state of never having had sexual intercourse, often considered as a physical condition or a personal choice.